diff --git a/libavformat/file.c b/libavformat/file.c
index defe3165e2c73a8f294051a181ba248759c353ba..8c41a3c3724e4a0a3c746f759fe8255abd271af0 100644
--- a/libavformat/file.c
+++ b/libavformat/file.c
@@ -135,7 +135,7 @@ static int file_open(URLContext *h, const char *filename, int flags)
 static int64_t file_seek(URLContext *h, int64_t pos, int whence)
 {
     FileContext *c = h->priv_data;
-    int ret;
+    off_t ret;
 
     if (whence == AVSEEK_SIZE) {
         struct stat st;