diff --git a/DZNetworking/Core/DZURLSession.m b/DZNetworking/Core/DZURLSession.m
index d8006d7..7d11a6f 100644
--- a/DZNetworking/Core/DZURLSession.m
+++ b/DZNetworking/Core/DZURLSession.m
@@ -73,6 +73,8 @@ - (instancetype)init
         
         _session = [NSURLSession sessionWithConfiguration:defaultConfig delegate:self delegateQueue:[NSOperationQueue currentQueue]];
         
+        _useActivityManager = YES;
+        
     }
     
     return self;