diff --git a/AFNetworking/AFHTTPRequestOperation.m b/AFNetworking/AFHTTPRequestOperation.m
index 53ac92f3a9..f33573d2c5 100644
--- a/AFNetworking/AFHTTPRequestOperation.m
+++ b/AFNetworking/AFHTTPRequestOperation.m
@@ -56,30 +56,32 @@ - (id)initWithRequest:(NSURLRequest *)request {
     //by default we will use the queue that created the request.
     self.callbackQueue = dispatch_get_current_queue();
     
+    __weak AFHTTPRequestOperation *weakSelf = self;
     super.completionBlock = ^ {
-        if (_completionBlock) {
-            _completionBlock(); //call any child completion blocks that may have been passed in that they may want to run
+        AFHTTPRequestOperation *strongSelf = weakSelf;
+        if (strongSelf->_completionBlock) {
+            strongSelf->_completionBlock(); //call any child completion blocks that may have been passed in that they may want to run
         }
         
-        if ([self isCancelled]) {
+        if ([strongSelf isCancelled]) {
 #if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_4_0
-            [self endBackgroundTask];
+            [strongSelf endBackgroundTask];
 #endif
-            self.finishedBlock = nil;
+            strongSelf.finishedBlock = nil;
             return;
         }
         
-        if (self.finishedBlock) {
-            dispatch_sync(self.callbackQueue, ^(void) {
-                self.finishedBlock();
+        if (strongSelf.finishedBlock) {
+            dispatch_sync(strongSelf.callbackQueue, ^(void) {
+                strongSelf.finishedBlock();
             });
 #if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_4_0
-            [self endBackgroundTask];
+            [strongSelf endBackgroundTask];
 #endif
-            self.finishedBlock = nil;
+            strongSelf.finishedBlock = nil;
         } else {
 #if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_4_0
-            [self endBackgroundTask];
+            [strongSelf endBackgroundTask];
 #endif
         }
     };
diff --git a/AFNetworking/AFURLConnectionOperation.m b/AFNetworking/AFURLConnectionOperation.m
index 0d7c61b522..7fd218ed23 100644
--- a/AFNetworking/AFURLConnectionOperation.m
+++ b/AFNetworking/AFURLConnectionOperation.m
@@ -256,8 +256,9 @@ - (void)setCompletionBlock:(void (^)(void))block {
     } else {
         __weak id _blockSelf = self;
         [super setCompletionBlock:^ {
+            id strongSelf = _blockSelf;
             block();
-            [_blockSelf setCompletionBlock:nil];
+            [strongSelf setCompletionBlock:nil];
         }];
     }
 }