diff --git a/iOS/QGVAPlayer/QGVAPlayer/Classes/Controllers/Decoders/QGMP4FrameHWDecoder.m b/iOS/QGVAPlayer/QGVAPlayer/Classes/Controllers/Decoders/QGMP4FrameHWDecoder.m
index c9149197..5192f16d 100644
--- a/iOS/QGVAPlayer/QGVAPlayer/Classes/Controllers/Decoders/QGMP4FrameHWDecoder.m
+++ b/iOS/QGVAPlayer/QGVAPlayer/Classes/Controllers/Decoders/QGMP4FrameHWDecoder.m
@@ -469,7 +469,7 @@ - (void)onInputEnd {
 }
 
 //decode callback
-void didDecompress(void *decompressionOutputRefCon, void *sourceFrameRefCon, OSStatus status, VTDecodeInfoFlags infoFlags, CVImageBufferRef pixelBuffer, CMTime presentationTimeStamp, CMTime presentationDuration ){
+static void didDecompress(void *decompressionOutputRefCon, void *sourceFrameRefCon, OSStatus status, VTDecodeInfoFlags infoFlags, CVImageBufferRef pixelBuffer, CMTime presentationTimeStamp, CMTime presentationDuration ){
     
     CVPixelBufferRef *outputPixelBuffer = (CVPixelBufferRef *)sourceFrameRefCon;
     *outputPixelBuffer = CVPixelBufferRetain(pixelBuffer);