diff --git a/src/mountfsd/mountwork.c b/src/mountfsd/mountwork.c
index 0e0bd964ee..4c321ce1c0 100644
--- a/src/mountfsd/mountwork.c
+++ b/src/mountfsd/mountwork.c
@@ -124,7 +124,7 @@ static int validate_image_fd(int fd, MountImageParameters *p) {
                         return r;
         }
 
-        fl = fd_verify_safe_flags(fd);
+        fl = fd_verify_safe_flags_full(fd, O_NONBLOCK);
         if (fl < 0)
                 return log_debug_errno(fl, "Image file descriptor has unsafe flags set: %m");