diff --git a/AFNetworking/AFNetworkActivityIndicatorManager.m b/AFNetworking/AFNetworkActivityIndicatorManager.m
index a000a14..651773a 100644
--- a/AFNetworking/AFNetworkActivityIndicatorManager.m
+++ b/AFNetworking/AFNetworkActivityIndicatorManager.m
@@ -28,9 +28,9 @@
 static NSTimeInterval const kAFNetworkActivityIndicatorInvisibilityDelay = 0.17;
 
 @interface AFNetworkActivityIndicatorManager ()
-@property (readwrite, assign) NSInteger activityCount;
+@property (readwrite, nonatomic, assign) NSInteger activityCount;
 @property (readwrite, nonatomic, strong) NSTimer *activityIndicatorVisibilityTimer;
-@property (readonly, getter = isNetworkActivityIndicatorVisible) BOOL networkActivityIndicatorVisible;
+@property (readonly, nonatomic, getter = isNetworkActivityIndicatorVisible) BOOL networkActivityIndicatorVisible;
 
 - (void)updateNetworkActivityIndicatorVisibility;
 - (void)updateNetworkActivityIndicatorVisibilityDelayed;