diff --git a/AFNetworking/AFNetworkActivityIndicatorManager.m b/AFNetworking/AFNetworkActivityIndicatorManager.m
index 5751d16..cdfe874 100644
--- a/AFNetworking/AFNetworkActivityIndicatorManager.m
+++ b/AFNetworking/AFNetworkActivityIndicatorManager.m
@@ -28,7 +28,7 @@
 static NSTimeInterval const kAFNetworkActivityIndicatorInvisibilityDelay = 0.17;
 
 @interface AFNetworkActivityIndicatorManager ()
-@property (readwrite, atomic, assign) NSInteger activityCount;
+@property (readwrite, assign) NSInteger activityCount;
 @property (readwrite, nonatomic, retain) NSTimer *activityIndicatorVisibilityTimer;
 @property (readonly, getter = isNetworkActivityIndicatorVisible) BOOL networkActivityIndicatorVisible;
 
@@ -52,6 +52,10 @@ static NSTimeInterval const kAFNetworkActivityIndicatorInvisibilityDelay = 0.17;
     return _sharedManager;
 }
 
++ (NSSet *)keyPathsForValuesAffectingIsNetworkActivityIndicatorVisible {
+    return [NSSet setWithObject:@"activityCount"];
+}
+
 - (id)init {
     self = [super init];
     if (!self) {
@@ -124,10 +128,6 @@ static NSTimeInterval const kAFNetworkActivityIndicatorInvisibilityDelay = 0.17;
     [self updateNetworkActivityIndicatorVisibilityDelayed];
 }
 
-+ (NSSet *)keyPathsForValuesAffectingIsNetworkActivityIndicatorVisible {
-    return [NSSet setWithObject:@"activityCount"];
-}
-
 @end
 
 #endif