diff --git a/AFNetworking/AFJSONUtilities.h b/AFNetworking/AFJSONUtilities.h
index 5eb1add..6ad1adb 100644
--- a/AFNetworking/AFJSONUtilities.h
+++ b/AFNetworking/AFJSONUtilities.h
@@ -75,19 +75,20 @@ static NSData * AFJSONEncode(id object, NSError **error) {
             *error = [[[NSError alloc] initWithDomain:NSStringFromClass([exception class]) code:0 userInfo:[exception userInfo]] autorelease];
         }
     } else if (_NSJSONSerializationClass && [_NSJSONSerializationClass respondsToSelector:_NSJSONSerializationSelector]) {
-        _af_nsjson_encode: {
-            NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[_NSJSONSerializationClass methodSignatureForSelector:_NSJSONSerializationSelector]];
-            invocation.target = _NSJSONSerializationClass;
-            invocation.selector = _NSJSONSerializationSelector;
-            
-            [invocation setArgument:&object atIndex:2]; // arguments 0 and 1 are self and _cmd respectively, automatically set by NSInvocation
-            NSUInteger writeOptions = 0;
-            [invocation setArgument:&writeOptions atIndex:3];
-            [invocation setArgument:error atIndex:4];
-            
-            [invocation invoke];
-            [invocation getReturnValue:&data];
-        }
+#ifdef _AFNETWORKING_PREFER_NSJSONSERIALIZATION_
+    _af_nsjson_encode:
+#endif
+        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[_NSJSONSerializationClass methodSignatureForSelector:_NSJSONSerializationSelector]];
+        invocation.target = _NSJSONSerializationClass;
+        invocation.selector = _NSJSONSerializationSelector;
+
+        [invocation setArgument:&object atIndex:2]; // arguments 0 and 1 are self and _cmd respectively, automatically set by NSInvocation
+        NSUInteger writeOptions = 0;
+        [invocation setArgument:&writeOptions atIndex:3];
+        [invocation setArgument:error atIndex:4];
+
+        [invocation invoke];
+        [invocation getReturnValue:&data];
     } else {
         NSDictionary *userInfo = [NSDictionary dictionaryWithObject:NSLocalizedString(@"Please either target a platform that supports NSJSONSerialization or add one of the following libraries to your project: JSONKit, SBJSON, or YAJL", nil) forKey:NSLocalizedRecoverySuggestionErrorKey];
         [[NSException exceptionWithName:NSInternalInconsistencyException reason:NSLocalizedString(@"No JSON generation functionality available", nil) userInfo:userInfo] raise];
@@ -145,19 +146,20 @@ static id AFJSONDecode(NSData *data, NSError **error) {
         [invocation invoke];
         [invocation getReturnValue:&JSON];
     } else if (_NSJSONSerializationClass && [_NSJSONSerializationClass respondsToSelector:_NSJSONSerializationSelector]) {
-        _af_nsjson_decode: {
-            NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[_NSJSONSerializationClass methodSignatureForSelector:_NSJSONSerializationSelector]];
-            invocation.target = _NSJSONSerializationClass;
-            invocation.selector = _NSJSONSerializationSelector;
-            
-            [invocation setArgument:&data atIndex:2]; // arguments 0 and 1 are self and _cmd respectively, automatically set by NSInvocation
-            NSUInteger readOptions = 0;
-            [invocation setArgument:&readOptions atIndex:3];
-            [invocation setArgument:error atIndex:4];
-            
-            [invocation invoke];
-            [invocation getReturnValue:&JSON];
-        }
+#ifdef _AFNETWORKING_PREFER_NSJSONSERIALIZATION_
+    _af_nsjson_decode:
+#endif
+        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[_NSJSONSerializationClass methodSignatureForSelector:_NSJSONSerializationSelector]];
+        invocation.target = _NSJSONSerializationClass;
+        invocation.selector = _NSJSONSerializationSelector;
+
+        [invocation setArgument:&data atIndex:2]; // arguments 0 and 1 are self and _cmd respectively, automatically set by NSInvocation
+        NSUInteger readOptions = 0;
+        [invocation setArgument:&readOptions atIndex:3];
+        [invocation setArgument:error atIndex:4];
+
+        [invocation invoke];
+        [invocation getReturnValue:&JSON];
     } else {
         NSDictionary *userInfo = [NSDictionary dictionaryWithObject:NSLocalizedString(@"Please either target a platform that supports NSJSONSerialization or add one of the following libraries to your project: JSONKit, SBJSON, or YAJL", nil) forKey:NSLocalizedRecoverySuggestionErrorKey];
         [[NSException exceptionWithName:NSInternalInconsistencyException reason:NSLocalizedString(@"No JSON parsing functionality available", nil) userInfo:userInfo] raise];
diff --git a/AFNetworking/AFXMLRequestOperation.m b/AFNetworking/AFXMLRequestOperation.m
index d01a084..48a6783 100644
--- a/AFNetworking/AFXMLRequestOperation.m
+++ b/AFNetworking/AFXMLRequestOperation.m
@@ -24,6 +24,7 @@
 
 #include <Availability.h>
 
+#if __MAC_OS_X_VERSION_MIN_REQUIRED
 static dispatch_queue_t af_xml_request_operation_processing_queue;
 static dispatch_queue_t xml_request_operation_processing_queue() {
     if (af_xml_request_operation_processing_queue == NULL) {
@@ -32,6 +33,7 @@ static dispatch_queue_t xml_request_operation_processing_queue() {
     
     return af_xml_request_operation_processing_queue;
 }
+#endif
 
 @interface AFXMLRequestOperation ()
 @property (readwrite, nonatomic, retain) NSXMLParser *responseXMLParser;