diff --git a/AFNetworking/AFHTTPClient.m b/AFNetworking/AFHTTPClient.m
index dd89721..3c896d9 100644
--- a/AFNetworking/AFHTTPClient.m
+++ b/AFNetworking/AFHTTPClient.m
@@ -301,7 +301,9 @@ static void AFNetworkReachabilityCallback(SCNetworkReachabilityRef __unused targ
         block(status);
     }
     
-    [[NSNotificationCenter defaultCenter] postNotificationName:AFNetworkingReachabilityDidChangeNotification object:nil userInfo:[NSDictionary dictionaryWithObject:[NSNumber numberWithInteger:status] forKey:AFNetworkingReachabilityNotificationStatusItem]];
+    dispatch_async(dispatch_get_main_queue(), ^{
+        [[NSNotificationCenter defaultCenter] postNotificationName:AFNetworkingReachabilityDidChangeNotification object:nil userInfo:[NSDictionary dictionaryWithObject:[NSNumber numberWithInteger:status] forKey:AFNetworkingReachabilityNotificationStatusItem]];
+    });
 }
 
 static const void * AFNetworkReachabilityRetainCallback(const void *info) {
diff --git a/AFNetworking/AFURLConnectionOperation.m b/AFNetworking/AFURLConnectionOperation.m
index e6cd729..0d27490 100644
--- a/AFNetworking/AFURLConnectionOperation.m
+++ b/AFNetworking/AFURLConnectionOperation.m
@@ -385,7 +385,10 @@ static inline BOOL AFStateTransitionIsValid(AFOperationState fromState, AFOperat
     
     if ([self isExecuting]) {
         [self.connection performSelector:@selector(cancel) onThread:[[self class] networkRequestThread] withObject:nil waitUntilDone:NO modes:[self.runLoopModes allObjects]];
-        [[NSNotificationCenter defaultCenter] postNotificationName:AFNetworkingOperationDidFinishNotification object:self];
+        
+        dispatch_async(dispatch_get_main_queue(), ^{
+            [[NSNotificationCenter defaultCenter] postNotificationName:AFNetworkingOperationDidFinishNotification object:self];
+        });
     }
     
     self.state = AFOperationPausedState;