diff --git a/libavformat/rmdec.c b/libavformat/rmdec.c
index e8f2657621..49048ac4eb 100644
--- a/libavformat/rmdec.c
+++ b/libavformat/rmdec.c
@@ -220,7 +220,7 @@ static int rm_read_audio_stream_info(AVFormatContext *s, AVIOContext *pb,
                 if (version == 5)
                     avio_r8(pb);
                 codecdata_length = avio_rb32(pb);
-                if(codecdata_length + AV_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
+                if((unsigned)codecdata_length > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE){
                     av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
                     return -1;
                 }