diff --git a/examples/postproc.c b/examples/postproc.c
index 2912fe6de..be08e920b 100644
--- a/examples/postproc.c
+++ b/examples/postproc.c
@@ -118,7 +118,7 @@ int main(int argc, char **argv) {
     };
 
     // Decode the frame with 15ms deadline
-    if (vpx_codec_decode(&codec, frame, frame_size, NULL, 15000))
+    if (vpx_codec_decode(&codec, frame, (unsigned int)frame_size, NULL, 15000))
       die_codec(&codec, "Failed to decode frame");
 
     while ((img = vpx_codec_get_frame(&codec, &iter)) != NULL) {