diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c
index adc5c68a0ba19d07815d5e991ceaae4dc98b1e5e..630675625c0e4abc673ff7eb8599d3e0561a9abb 100644
--- a/libavformat/mxfdec.c
+++ b/libavformat/mxfdec.c
@@ -1671,7 +1671,7 @@ static int mxf_timestamp_to_str(uint64_t timestamp, char **str)
     *str = av_mallocz(32);
     if (!*str)
         return AVERROR(ENOMEM);
-    strftime(*str, 32, "%F %T", &time);
+    strftime(*str, 32, "%Y-%m-%d %H:%M:%S", &time);
 
     return 0;
 }