diff --git a/libavformat/utils.c b/libavformat/utils.c
index bcdba8c5df..b167e96854 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -1823,7 +1823,7 @@ static int has_duration(AVFormatContext *ic)
         if (st->duration != AV_NOPTS_VALUE)
             return 1;
     }
-    if (ic->duration)
+    if (ic->duration != AV_NOPTS_VALUE)
         return 1;
     return 0;
 }