diff --git a/libavformat/omadec.c b/libavformat/omadec.c
index 9f3d3aa860..42954130bc 100644
--- a/libavformat/omadec.c
+++ b/libavformat/omadec.c
@@ -174,7 +174,7 @@ static int nprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size,
     taglen  = AV_RB32(&enc_header[pos + 32]);
     datalen = AV_RB32(&enc_header[pos + 36]) >> 4;
 
-    pos += 44L + taglen;
+    pos += 44LL + taglen;
 
     if (pos + (((uint64_t)datalen) << 4) > size)
         return -1;