diff --git a/vpxdec.c b/vpxdec.c
index df0b8199c..41c654fae 100644
--- a/vpxdec.c
+++ b/vpxdec.c
@@ -49,8 +49,8 @@
 
 static const char *exec_name;
 
-#define VP8_FOURCC (0x30385056)
-#define VP9_FOURCC (0x30395056)
+#define VP8_FOURCC (0x00385056)
+#define VP9_FOURCC (0x00395056)
 static const struct {
   char const *name;
   const vpx_codec_iface_t *(*iface)(void);