diff --git a/features/algebraic-type-forward-declaration.feature b/features/algebraic-type-forward-declaration.feature
index ab43a27..a3bff41 100644
--- a/features/algebraic-type-forward-declaration.feature
+++ b/features/algebraic-type-forward-declaration.feature
@@ -104,7 +104,7 @@ Feature: Outputting forward declarations in Algebraic Types
       {
         switch (_subtype) {
           case _SimpleADTSubtypesFirstSubtype: {
-            return [NSString stringWithFormat:@"%@ - FirstSubtype \n\t firstValue: %@; \n\t secondValue: %tu; \n", [super description], _firstSubtype_firstValue, _firstSubtype_secondValue];
+            return [NSString stringWithFormat:@"%@ - FirstSubtype \n\t firstValue: %@; \n\t secondValue: %llu; \n", [super description], _firstSubtype_firstValue, (unsigned long long)_firstSubtype_secondValue];
             break;
           }
           case _SimpleADTSubtypesSomeRandomSubtype: {
diff --git a/features/algebraic-types-coding.feature b/features/algebraic-types-coding.feature
index d6c8ec9..f69a609 100644
--- a/features/algebraic-types-coding.feature
+++ b/features/algebraic-types-coding.feature
@@ -113,7 +113,7 @@ Feature: Outputting Algebraic Types
       {
         switch (_subtype) {
           case _SimpleADTSubtypesFirstSubtype: {
-            return [NSString stringWithFormat:@"%@ - FirstSubtype \n\t firstValue: %@; \n\t secondValue: %tu; \n", [super description], _firstSubtype_firstValue, _firstSubtype_secondValue];
+            return [NSString stringWithFormat:@"%@ - FirstSubtype \n\t firstValue: %@; \n\t secondValue: %llu; \n", [super description], _firstSubtype_firstValue, (unsigned long long)_firstSubtype_secondValue];
             break;
           }
           case _SimpleADTSubtypesSecondSubtype: {
diff --git a/features/algebraic-types-cplusplus.feature b/features/algebraic-types-cplusplus.feature
index 8182d76..73894c4 100644
--- a/features/algebraic-types-cplusplus.feature
+++ b/features/algebraic-types-cplusplus.feature
@@ -100,7 +100,7 @@ Feature: Outputting ObjC++ Algebraic Types
       {
         switch (_subtype) {
           case _SimpleADTSubtypesFirstSubtype: {
-            return [NSString stringWithFormat:@"%@ - FirstSubtype \n\t firstValue: %@; \n\t secondValue: %tu; \n", [super description], _firstSubtype_firstValue, _firstSubtype_secondValue];
+            return [NSString stringWithFormat:@"%@ - FirstSubtype \n\t firstValue: %@; \n\t secondValue: %llu; \n", [super description], _firstSubtype_firstValue, (unsigned long long)_firstSubtype_secondValue];
             break;
           }
           case _SimpleADTSubtypesSomeRandomSubtype: {
diff --git a/features/algebraic-types.feature b/features/algebraic-types.feature
index 1f619c4..e2436e5 100644
--- a/features/algebraic-types.feature
+++ b/features/algebraic-types.feature
@@ -136,7 +136,7 @@ Feature: Outputting Algebraic Types
       {
         switch (_subtype) {
           case _SimpleADTSubtypesFirstSubtype: {
-            return [NSString stringWithFormat:@"%@ - FirstSubtype \n\t firstValue: %@; \n\t secondValue: %tu; \n", [super description], _firstSubtype_firstValue, _firstSubtype_secondValue];
+            return [NSString stringWithFormat:@"%@ - FirstSubtype \n\t firstValue: %@; \n\t secondValue: %llu; \n", [super description], _firstSubtype_firstValue, (unsigned long long)_firstSubtype_secondValue];
             break;
           }
           case _SimpleADTSubtypesSomeRandomSubtype: {
@@ -144,7 +144,7 @@ Feature: Outputting Algebraic Types
             break;
           }
           case _SimpleADTSubtypesSomeAttributeSubtype: {
-            return [NSString stringWithFormat:@"%@ - \n\t someAttributeSubtype: %tu; \n", [super description], _someAttributeSubtype];
+            return [NSString stringWithFormat:@"%@ - \n\t someAttributeSubtype: %llu; \n", [super description], (unsigned long long)_someAttributeSubtype];
             break;
           }
           case _SimpleADTSubtypesSecondSubtype: {
@@ -317,7 +317,7 @@ Feature: Outputting Algebraic Types
       {
         switch (_subtype) {
           case _SimpleADTSubtypesFirstSubtype: {
-            return [NSString stringWithFormat:@"%@ - FirstSubtype \n\t firstValue: %@; \n\t secondValue: %tu; \n", [super description], _firstSubtype_firstValue, _firstSubtype_secondValue];
+            return [NSString stringWithFormat:@"%@ - FirstSubtype \n\t firstValue: %@; \n\t secondValue: %llu; \n", [super description], _firstSubtype_firstValue, (unsigned long long)_firstSubtype_secondValue];
             break;
           }
           case _SimpleADTSubtypesSecondSubtype: {
@@ -488,7 +488,7 @@ Feature: Outputting Algebraic Types
       {
         switch (_subtype) {
           case _SimpleADTSubtypesFirstSubtype: {
-            return [NSString stringWithFormat:@"%@ - FirstSubtype \n\t firstValue: %@; \n\t secondValue: %tu; \n", [super description], _firstSubtype_firstValue, _firstSubtype_secondValue];
+            return [NSString stringWithFormat:@"%@ - FirstSubtype \n\t firstValue: %@; \n\t secondValue: %llu; \n", [super description], _firstSubtype_firstValue, (unsigned long long)_firstSubtype_secondValue];
             break;
           }
           case _SimpleADTSubtypesSomeRandomSubtype: {
diff --git a/features/coding.feature b/features/coding.feature
index a8b7c56..386ed45 100644
--- a/features/coding.feature
+++ b/features/coding.feature
@@ -70,7 +70,7 @@ Feature: Outputting Value Objects With Coded Values
 
       - (NSString *)description
       {
-        return [NSString stringWithFormat:@"%@ - \n\t doesUserLike: %@; \n\t identifier: %@; \n\t likeCount: %zd; \n\t numberOfRatings: %tu; \n", [super description], _doesUserLike ? @"YES" : @"NO", _identifier, _likeCount, _numberOfRatings];
+        return [NSString stringWithFormat:@"%@ - \n\t doesUserLike: %@; \n\t identifier: %@; \n\t likeCount: %lld; \n\t numberOfRatings: %llu; \n", [super description], _doesUserLike ? @"YES" : @"NO", _identifier, (long long)_likeCount, (unsigned long long)_numberOfRatings];
       }
 
       - (void)encodeWithCoder:(NSCoder *)aCoder
diff --git a/features/configuration.feature b/features/configuration.feature
index eb918b4..d51b52c 100644
--- a/features/configuration.feature
+++ b/features/configuration.feature
@@ -136,7 +136,7 @@ Feature: Outputting Value Objects With A Custom Plugin
 
       - (NSString *)description
       {
-        return [NSString stringWithFormat:@"%@ - \n\t doesUserLike: %@; \n\t identifier: %@; \n\t likeCount: %zd; \n\t numberOfRatings: %tu; \n", [super description], _doesUserLike ? @"YES" : @"NO", _identifier, _likeCount, _numberOfRatings];
+        return [NSString stringWithFormat:@"%@ - \n\t doesUserLike: %@; \n\t identifier: %@; \n\t likeCount: %lld; \n\t numberOfRatings: %llu; \n", [super description], _doesUserLike ? @"YES" : @"NO", _identifier, (long long)_likeCount, (unsigned long long)_numberOfRatings];
       }
 
       @end
diff --git a/features/cplusplus.feature b/features/cplusplus.feature
index 41794e3..455380b 100644
--- a/features/cplusplus.feature
+++ b/features/cplusplus.feature
@@ -73,7 +73,7 @@ Feature: Outputting C++ Value Objects
 
       - (NSString *)description
       {
-        return [NSString stringWithFormat:@"%@ - \n\t doesUserLike: %@; \n\t identifier: %@; \n\t likeCount: %zd; \n\t numberOfRatings: %tu; \n", [super description], _doesUserLike ? @"YES" : @"NO", _identifier, _likeCount, _numberOfRatings];
+        return [NSString stringWithFormat:@"%@ - \n\t doesUserLike: %@; \n\t identifier: %@; \n\t likeCount: %lld; \n\t numberOfRatings: %llu; \n", [super description], _doesUserLike ? @"YES" : @"NO", _identifier, (long long)_likeCount, (unsigned long long)_numberOfRatings];
       }
 
       - (NSUInteger)hash
diff --git a/features/forward-declaration.feature b/features/forward-declaration.feature
index f2de8ef..4992920 100644
--- a/features/forward-declaration.feature
+++ b/features/forward-declaration.feature
@@ -100,7 +100,7 @@ Feature: Outputting Value Objects With Forward Declarations
 
       - (NSString *)description
       {
-        return [NSString stringWithFormat:@"%@ - \n\t doesUserLike: %@; \n\t identifier: %@; \n\t likeCount: %zd; \n\t numberOfRatings: %tu; \n\t proxy: %@; \n\t followers: %@; \n\t helloObj: %@; \n\t worldVc: %@; \n", [super description], _doesUserLike ? @"YES" : @"NO", _identifier, _likeCount, _numberOfRatings, _proxy, _followers, _helloObj, _worldVc];
+        return [NSString stringWithFormat:@"%@ - \n\t doesUserLike: %@; \n\t identifier: %@; \n\t likeCount: %lld; \n\t numberOfRatings: %llu; \n\t proxy: %@; \n\t followers: %@; \n\t helloObj: %@; \n\t worldVc: %@; \n", [super description], _doesUserLike ? @"YES" : @"NO", _identifier, (long long)_likeCount, (unsigned long long)_numberOfRatings, _proxy, _followers, _helloObj, _worldVc];
       }
 
       - (NSUInteger)hash
@@ -230,7 +230,7 @@ Feature: Outputting Value Objects With Forward Declarations
 
       - (NSString *)description
       {
-        return [NSString stringWithFormat:@"%@ - \n\t doesUserLike: %@; \n\t identifier: %@; \n\t likeCount: %zd; \n\t countIconHeight: %f; \n\t countIconWidth: %f; \n\t numberOfRatings: %tu; \n\t foo: %@; \n", [super description], _doesUserLike ? @"YES" : @"NO", _identifier, _likeCount, _countIconHeight, _countIconWidth, _numberOfRatings, _foo];
+        return [NSString stringWithFormat:@"%@ - \n\t doesUserLike: %@; \n\t identifier: %@; \n\t likeCount: %lld; \n\t countIconHeight: %f; \n\t countIconWidth: %f; \n\t numberOfRatings: %llu; \n\t foo: %@; \n", [super description], _doesUserLike ? @"YES" : @"NO", _identifier, (long long)_likeCount, _countIconHeight, _countIconWidth, (unsigned long long)_numberOfRatings, _foo];
       }
 
       @end
diff --git a/features/nullability.feature b/features/nullability.feature
index 272d137..72600f4 100644
--- a/features/nullability.feature
+++ b/features/nullability.feature
@@ -219,7 +219,7 @@ Feature: Outputting Objects With Nullability Annotations
       {
         switch (_subtype) {
           case _SimpleADTSubtypesFirstSubtype: {
-            return [NSString stringWithFormat:@"%@ - FirstSubtype \n\t firstValue: %@; \n\t secondValue: %tu; \n", [super description], _firstSubtype_firstValue, _firstSubtype_secondValue];
+            return [NSString stringWithFormat:@"%@ - FirstSubtype \n\t firstValue: %@; \n\t secondValue: %llu; \n", [super description], _firstSubtype_firstValue, (unsigned long long)_firstSubtype_secondValue];
             break;
           }
           case _SimpleADTSubtypesSomeRandomSubtype: {
diff --git a/features/object.feature b/features/object.feature
index 1975cba..85af8f5 100644
--- a/features/object.feature
+++ b/features/object.feature
@@ -80,7 +80,7 @@ Feature: Outputting Objects
 
       - (NSString *)description
       {
-        return [NSString stringWithFormat:@"%@ - \n\t doesUserLike: %@; \n\t identifier: %@; \n\t likeCount: %zd; \n\t numberOfRatings: %u; \n\t someType: %@; \n\t someClass: %@; \n\t someBlock: %@; \n", [super description], _doesUserLike ? @"YES" : @"NO", _identifier, _likeCount, _numberOfRatings, _someType, _someClass, _someBlock];
+        return [NSString stringWithFormat:@"%@ - \n\t doesUserLike: %@; \n\t identifier: %@; \n\t likeCount: %lld; \n\t numberOfRatings: %u; \n\t someType: %@; \n\t someClass: %@; \n\t someBlock: %@; \n", [super description], _doesUserLike ? @"YES" : @"NO", _identifier, (long long)_likeCount, _numberOfRatings, _someType, _someClass, _someBlock];
       }
 
       @end
@@ -161,7 +161,7 @@ Feature: Outputting Objects
 
       - (NSString *)description
       {
-        return [NSString stringWithFormat:@"%@ - \n\t doesUserLike: %@; \n\t identifier: %@; \n\t likeCount: %zd; \n\t countIconHeight: %f; \n\t countIconWidth: %f; \n\t numberOfRatings: %tu; \n", [super description], _doesUserLike ? @"YES" : @"NO", _identifier, _likeCount, _countIconHeight, _countIconWidth, _numberOfRatings];
+        return [NSString stringWithFormat:@"%@ - \n\t doesUserLike: %@; \n\t identifier: %@; \n\t likeCount: %lld; \n\t countIconHeight: %f; \n\t countIconWidth: %f; \n\t numberOfRatings: %llu; \n", [super description], _doesUserLike ? @"YES" : @"NO", _identifier, (long long)_likeCount, _countIconHeight, _countIconWidth, (unsigned long long)_numberOfRatings];
       }
 
       @end
diff --git a/features/value_object.feature b/features/value_object.feature
index 2ab5685..1081d4c 100644
--- a/features/value_object.feature
+++ b/features/value_object.feature
@@ -85,7 +85,7 @@ Feature: Outputting Value Objects
 
       - (NSString *)description
       {
-        return [NSString stringWithFormat:@"%@ - \n\t doesUserLike: %@; \n\t identifier: %@; \n\t likeCount: %zd; \n\t numberOfRatings: %u; \n\t someType: %@; \n\t someClass: %@; \n\t someBlock: %@; \n", [super description], _doesUserLike ? @"YES" : @"NO", _identifier, _likeCount, _numberOfRatings, _someType, _someClass, _someBlock];
+        return [NSString stringWithFormat:@"%@ - \n\t doesUserLike: %@; \n\t identifier: %@; \n\t likeCount: %lld; \n\t numberOfRatings: %u; \n\t someType: %@; \n\t someClass: %@; \n\t someBlock: %@; \n", [super description], _doesUserLike ? @"YES" : @"NO", _identifier, (long long)_likeCount, _numberOfRatings, _someType, _someClass, _someBlock];
       }
 
       - (NSUInteger)hash
@@ -208,7 +208,7 @@ Feature: Outputting Value Objects
 
       - (NSString *)description
       {
-        return [NSString stringWithFormat:@"%@ - \n\t doesUserLike: %@; \n\t identifier: %@; \n\t likeCount: %zd; \n\t countIconHeight: %f; \n\t countIconWidth: %f; \n\t numberOfRatings: %tu; \n", [super description], _doesUserLike ? @"YES" : @"NO", _identifier, _likeCount, _countIconHeight, _countIconWidth, _numberOfRatings];
+        return [NSString stringWithFormat:@"%@ - \n\t doesUserLike: %@; \n\t identifier: %@; \n\t likeCount: %lld; \n\t countIconHeight: %f; \n\t countIconWidth: %f; \n\t numberOfRatings: %llu; \n", [super description], _doesUserLike ? @"YES" : @"NO", _identifier, (long long)_likeCount, _countIconHeight, _countIconWidth, (unsigned long long)_numberOfRatings];
       }
 
       @end
diff --git a/src/__tests__/plugins/description-test.ts b/src/__tests__/plugins/description-test.ts
index 285e206..18b8d82 100644
--- a/src/__tests__/plugins/description-test.ts
+++ b/src/__tests__/plugins/description-test.ts
@@ -412,7 +412,7 @@ describe('ObjectSpecPlugins.Description', function() {
           {
             belongsToProtocol:Maybe.Just('NSObject'),
             code: [
-              'return [NSString stringWithFormat:@"%@ - \\n\\t age: %zd; \\n", [super description], _age];'
+              'return [NSString stringWithFormat:@"%@ - \\n\\t age: %lld; \\n", [super description], (long long)_age];'
             ],
             comments: [],
             compilerAttributes:[],
@@ -465,7 +465,7 @@ describe('ObjectSpecPlugins.Description', function() {
           {
             belongsToProtocol:Maybe.Just('NSObject'),
             code: [
-              'return [NSString stringWithFormat:@"%@ - \\n\\t age: %tu; \\n", [super description], _age];'
+              'return [NSString stringWithFormat:@"%@ - \\n\\t age: %llu; \\n", [super description], (unsigned long long)_age];'
             ],
             comments: [],
             compilerAttributes:[],
@@ -943,7 +943,7 @@ describe('ObjectSpecPlugins.Description', function() {
           {
             belongsToProtocol:Maybe.Just('NSObject'),
             code: [
-              'return [NSString stringWithFormat:@"%@ - \\n\\t age: %tu; \\n", [super description], _age];'
+              'return [NSString stringWithFormat:@"%@ - \\n\\t age: %llu; \\n", [super description], (unsigned long long)_age];'
             ],
             comments: [],
             compilerAttributes:[],
@@ -1429,7 +1429,7 @@ describe('AlgebraicTypePlugins.Description', function() {
           code: [
             'switch (_subtype) {',
             '  case _TestSubtypesSomeSubtype: {',
-            '    return [NSString stringWithFormat:@"%@ - SomeSubtype \\n\\t someString: %@; \\n\\t someUnsignedInteger: %tu; \\n", [super description], _someSubtype_someString, _someSubtype_someUnsignedInteger];',
+            '    return [NSString stringWithFormat:@"%@ - SomeSubtype \\n\\t someString: %@; \\n\\t someUnsignedInteger: %llu; \\n", [super description], _someSubtype_someString, (unsigned long long)_someSubtype_someUnsignedInteger];',
             '    break;',
             '  }',
             '  case _TestSubtypesCoolSingleAttributeBoolSubtype: {',
diff --git a/src/plugins/description.ts b/src/plugins/description.ts
index a641750..5276844 100644
--- a/src/plugins/description.ts
+++ b/src/plugins/description.ts
@@ -34,6 +34,12 @@ function useValueAccessor(valueAccessor:string):string {
   return valueAccessor;
 }
 
+function castValueAccessorValue(castToApply: string):(valueAccessor:string) => string {
+  return function(valueAccessor:string):string {
+    return '(' + castToApply + ')' + valueAccessor;
+  };
+}
+
 function useFunctionReturnValueAsDescriptionValue(functionToCall:string):(valueAccessor:string) => string {
   return function(valueAccessor:string):string {
     return functionToCall + '(' + valueAccessor + ')';
@@ -72,15 +78,15 @@ function attributeDescriptionForType(type:ObjC.Type):AttributeDescription {
     NSInteger: function() {
       return {
         descriptionFunctionImport: Maybe.Nothing<ObjC.Import>(),
-        token: '%zd',
-        valueGenerator: useValueAccessor
+        token: '%lld',
+        valueGenerator: castValueAccessorValue('long long')
       };
     },
     NSUInteger: function() {
       return {
         descriptionFunctionImport: Maybe.Nothing<ObjC.Import>(),
-        token: '%tu',
-        valueGenerator: useValueAccessor
+        token: '%llu',
+        valueGenerator: castValueAccessorValue('unsigned long long')
       };
     },
     double: function() {