diff --git a/libavformat/apngdec.c b/libavformat/apngdec.c
index c6403a191d..d9f9ee3f30 100644
--- a/libavformat/apngdec.c
+++ b/libavformat/apngdec.c
@@ -269,7 +269,7 @@ static int decode_fctl_chunk(AVFormatContext *s, APNGDemuxContext *ctx, AVPacket
     /* default is hundredths of seconds */
     if (!delay_den)
         delay_den = 100;
-    if (!delay_num || delay_den / delay_num > ctx->max_fps) {
+    if (!delay_num || (ctx->max_fps && delay_den / delay_num > ctx->max_fps)) {
         delay_num = 1;
         delay_den = ctx->default_fps;
     }