diff --git a/Code/ObjectMapping/RKObjectMappingOperation.m b/Code/ObjectMapping/RKObjectMappingOperation.m
index 8135d0f150..aaff77eadf 100644
--- a/Code/ObjectMapping/RKObjectMappingOperation.m
+++ b/Code/ObjectMapping/RKObjectMappingOperation.m
@@ -160,11 +160,20 @@ - (id)transformValue:(id)value atKeyPath:keyPath toType:(Class)destinationType {
         if ([destinationType isSubclassOfClass:[NSArray class]]) {
             return [(NSSet*)value allObjects];
         }
+    } else if ([sourceType isSubclassOfClass:[NSOrderedSet class]]) {
+        // OrderedSet -> Array
+        if ([destinationType isSubclassOfClass:[NSArray class]]) {
+            return [(NSOrderedSet*)value array];
+        }
     } else if ([sourceType isSubclassOfClass:[NSArray class]]) {
         // Array -> Set
         if ([destinationType isSubclassOfClass:[NSSet class]]) {
             return [NSSet setWithArray:value];
         }
+        // Array -> OrderedSet
+        if ([destinationType isSubclassOfClass:[NSOrderedSet class]]) {
+            return [NSOrderedSet orderedSetWithArray:value];
+        }
     } else if ([sourceType isSubclassOfClass:[NSNumber class]] && [destinationType isSubclassOfClass:[NSDate class]]) {
         // Number -> Date
         return [NSDate dateWithTimeIntervalSince1970:[(NSNumber*)value intValue]];