diff --git a/libavformat/apetag.c b/libavformat/apetag.c
index 68f2df6c56..d4be91c837 100644
--- a/libavformat/apetag.c
+++ b/libavformat/apetag.c
@@ -118,7 +118,7 @@ static int ape_tag_read_field(AVFormatContext *s)
 int64_t ff_ape_parse_tag(AVFormatContext *s)
 {
     AVIOContext *pb = s->pb;
-    int file_size = avio_size(pb);
+    int64_t file_size = avio_size(pb);
     uint32_t val, fields, tag_bytes;
     uint8_t buf[8];
     int64_t tag_start;