diff --git a/fs/driver/fs_blockproxy.c b/fs/driver/fs_blockproxy.c
index b03aa4f95e..d08f497f73 100644
--- a/fs/driver/fs_blockproxy.c
+++ b/fs/driver/fs_blockproxy.c
@@ -167,7 +167,6 @@ int block_proxy(FAR const char *blkdev, int oflags)
   int fd;
 
   DEBUGASSERT(blkdev);
-  DEBUGASSERT((oflags & (O_CREAT | O_EXCL | O_APPEND | O_TRUNC)) == 0);
 
   /* Create a unique temporary file name for the character device */