diff --git a/libavformat/file.c b/libavformat/file.c
index 209957b..e805dd9 100644
--- a/libavformat/file.c
+++ b/libavformat/file.c
@@ -90,8 +90,8 @@ static int file_check(URLContext *h, int mask)
     if (ret < 0)
         return AVERROR(errno);
 
-    ret |= st.st_mode&S_IRUSR ? mask&AVIO_FLAG_READ  : 0;
-    ret |= st.st_mode&S_IWUSR ? mask&AVIO_FLAG_WRITE : 0;
+    ret |= st.st_mode&(S_IRUSR|S_IROTH) ? mask&AVIO_FLAG_READ  : 0;
+    ret |= st.st_mode&(S_IWUSR|S_IWOTH) ? mask&AVIO_FLAG_WRITE : 0;
 
     return ret;
 }