diff --git a/libavformat/mccdec.c b/libavformat/mccdec.c
index 8a9eff4c2a..71882d13a9 100644
--- a/libavformat/mccdec.c
+++ b/libavformat/mccdec.c
@@ -155,7 +155,7 @@ static int time_tracker_set_time(TimeTracker *tt, const MCCTimecode *tc, void *l
 
 struct ValidTimeCodeRate {
     AVRational  rate;
-    const char *str;
+    char        str[5];
 };
 
 static struct ValidTimeCodeRate valid_time_code_rates[] = {