diff --git a/ext/flac/gstflacdec.c b/ext/flac/gstflacdec.c
index 08a93bd242..3537fc2506 100644
--- a/ext/flac/gstflacdec.c
+++ b/ext/flac/gstflacdec.c
@@ -421,7 +421,7 @@ gst_flac_dec_scan_got_frame (GstFlacDec * flacdec, guint8 * data, guint size,
   }
 
   if (flacdec->min_blocksize == flacdec->max_blocksize) {
-    *last_sample_num = (val + 1) * flacdec->min_blocksize;
+    *last_sample_num = ((guint64) val + 1) * flacdec->min_blocksize;
   } else {
     *last_sample_num = 0;       /* FIXME: + length of last block in samples */
   }