X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fmount_image.c;h=586722e50fc84fb25c27f1a127583b8a4d6c4da5;hp=04be3f6f73c8e3ea9b6b87de79959921ee3302b9;hb=90f7dd42bf7335eb1de33577e425796dfaa21209;hpb=5c1b50fdca21aaaddbdb34f5f7beec7d67016984

diff --git a/src/mount_image.c b/src/mount_image.c
index 04be3f6f..586722e5 100644
--- a/src/mount_image.c
+++ b/src/mount_image.c
@@ -164,7 +164,8 @@ get_lookup_flags(const struct wimfs_context *ctx)
 static inline int
 flags_writable(int open_flags)
 {
-	return open_flags & (O_RDWR | O_WRONLY);
+	int accmode = (open_flags & O_ACCMODE);
+	return (accmode == O_RDWR || accmode == O_WRONLY);
 }
 
 /*