diff --git a/libavformat/utils.c b/libavformat/utils.c
index e51884774b3bc..e8430b23fa733 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -218,7 +218,7 @@ AVOutputFormat *av_guess_format(const char *short_name, const char *filename,
     score_max = 0;
     while ((fmt = av_oformat_next(fmt))) {
         score = 0;
-        if (fmt->name && short_name && !strcmp(fmt->name, short_name))
+        if (fmt->name && short_name && !av_strcasecmp(fmt->name, short_name))
             score += 100;
         if (fmt->mime_type && mime_type && !strcmp(fmt->mime_type, mime_type))
             score += 10;