diff --git a/samples/swaggerdoc/MyController2U.pas b/samples/swaggerdoc/MyController2U.pas
index 39ae73cd3..dfddca2e1 100644
--- a/samples/swaggerdoc/MyController2U.pas
+++ b/samples/swaggerdoc/MyController2U.pas
@@ -8,7 +8,8 @@ interface
   MVCFramework.Commons,
   MVCFramework.Swagger.Commons,
   MVCFramework.Serializer.Commons,
-  MVCFramework.Middleware.Authentication.RoleBasedAuthHandler;
+  MVCFramework.Middleware.Authentication.RoleBasedAuthHandler,
+  MVCFramework.Nullables;
 
 type
 
@@ -18,10 +19,12 @@   TAddress = class
     FStreet: string;
     FNumber: Integer;
     FCity: string;
+    FPostalCode: NullableString;
   public
     property Street: string read FStreet write FStreet;
     property Number: Integer read FNumber write FNumber;
     property City: string read FCity write FCity;
+    property PostalCode: NullableString read FPostalCode write FPostalCode;
   end;
 
   [MVCNameCase(ncLowerCase)]
diff --git a/sources/MVCFramework.Swagger.Commons.pas b/sources/MVCFramework.Swagger.Commons.pas
index f86e0940c..170926439 100644
--- a/sources/MVCFramework.Swagger.Commons.pas
+++ b/sources/MVCFramework.Swagger.Commons.pas
@@ -244,6 +244,7 @@ implementation
   System.RegularExpressions,
   System.TypInfo,
   MVCFramework,
+  MVCFramework.Nullables,
   MVCFramework.Serializer.Abstract,
   MVCFramework.Serializer.Commons,
   Swag.Doc.Path.Operation.Response,
@@ -638,6 +639,36 @@ class function TMVCSwagger.TypeKindToMVCSwagSchemaType(APropType: TRttiType): TM
       begin
         if APropType.Handle = TypeInfo(TGUID) then
           Result := stGuid
+        else if APropType.Handle = TypeInfo(NullableString) then
+          Result := stString
+        else if APropType.Handle = TypeInfo(NullableCurrency) then
+          Result := stNumber
+        else if APropType.Handle = TypeInfo(NullableBoolean) then
+          Result := stBoolean
+        else if APropType.Handle = TypeInfo(NullableTDate) then
+          Result := stDate
+        else if APropType.Handle = TypeInfo(NullableTTime) then
+          Result := stTime
+        else if APropType.Handle = TypeInfo(NullableTDateTime) then
+          Result := stDateTime
+        else if APropType.Handle = TypeInfo(NullableSingle) then
+          Result := stNumber
+        else if APropType.Handle = TypeInfo(NullableDouble) then
+          Result := stNumber
+        else if APropType.Handle = TypeInfo(NullableExtended) then
+          Result := stNumber
+        else if APropType.Handle = TypeInfo(NullableInt16) then
+          Result := stInteger
+        else if APropType.Handle = TypeInfo(NullableUInt16) then
+          Result := stInteger
+        else if APropType.Handle = TypeInfo(NullableInt32) then
+          Result := stInteger
+        else if APropType.Handle = TypeInfo(NullableUInt32) then
+          Result := stInteger
+        else if APropType.Handle = TypeInfo(NullableInt64) then
+          Result := stInt64
+        else if APropType.Handle = TypeInfo(NullableUInt64) then
+          Result := stInt64;
       end;
     tkInteger:
       Result := stInteger;