diff --git a/drivers/filesystems/ext2/inc/ext2fs.h b/drivers/filesystems/ext2/inc/ext2fs.h
index 525a1d1bc9e..10ec2eab5f2 100644
--- a/drivers/filesystems/ext2/inc/ext2fs.h
+++ b/drivers/filesystems/ext2/inc/ext2fs.h
@@ -2495,7 +2495,8 @@ struct buffer_head *ext3_bread(struct ext2_icb *icb, struct inode *inode,
 int add_dirent_to_buf(struct ext2_icb *icb, struct dentry *dentry,
                       struct inode *inode, struct ext3_dir_entry_2 *de,
                       struct buffer_head *bh);
-#if !defined(__REACTOS__) || defined(_MSC_VER)
+#if !defined(__REACTOS__) || (defined(_MSC_VER) && !defined(__clang__))
+/* FIXME: Inspect the clang-cl code path */
 struct ext3_dir_entry_2 *
             do_split(struct ext2_icb *icb, struct inode *dir,
                      struct buffer_head **bh,struct dx_frame *frame,
diff --git a/drivers/filesystems/ext2/src/ext3/htree.c b/drivers/filesystems/ext2/src/ext3/htree.c
index 8d5bd4dab42..edf59350bc1 100644
--- a/drivers/filesystems/ext2/src/ext3/htree.c
+++ b/drivers/filesystems/ext2/src/ext3/htree.c
@@ -1596,6 +1596,11 @@ int ext3_release_dir (struct inode * inode, struct file * filp)
     return 0;
 }
 
+/* FIXME: Inspect the clang-cl code path */
+#if defined(__REACTOS__) && defined(__clang__)
+struct ext3_dir_entry_2* do_split(struct ext2_icb *icb, struct inode *dir, struct buffer_head **bh,struct dx_frame *frame, struct dx_hash_info *hinfo, int *error);
+#endif
+
 /*
  * Returns 0 for success, or a negative error value
  */