diff --git a/framework/Source/iOS/GPUImageMovieWriter.h b/framework/Source/iOS/GPUImageMovieWriter.h
index f0b2c6ad8..645598097 100755
--- a/framework/Source/iOS/GPUImageMovieWriter.h
+++ b/framework/Source/iOS/GPUImageMovieWriter.h
@@ -36,7 +36,7 @@ extern NSString *const kGPUImageColorSwizzlingFragmentShaderString;
 @property(readwrite, nonatomic) BOOL shouldInvalidateAudioSampleWhenDone;
 @property(nonatomic, copy) void(^completionBlock)(void);
 @property(nonatomic, copy) void(^failureBlock)(NSError*);
-@property(nonatomic, assign) id<GPUImageMovieWriterDelegate> delegate;
+@property(nonatomic, weak) id<GPUImageMovieWriterDelegate> delegate;
 @property(readwrite, nonatomic) BOOL encodingLiveVideo;
 @property(nonatomic, copy) BOOL(^videoInputReadyCallback)(void);
 @property(nonatomic, copy) BOOL(^audioInputReadyCallback)(void);