diff --git a/check/mode-lowmem.c b/check/mode-lowmem.c
index 6d7ae2bc..157a0b70 100644
--- a/check/mode-lowmem.c
+++ b/check/mode-lowmem.c
@@ -2082,6 +2082,25 @@ static int check_file_extent(struct btrfs_root *root, struct btrfs_path *path,
 		}
 	}
 
+	/*
+	 * Extra check for compressed extents:
+	 * Btrfs doesn't allow NODATASUM and compressed extent co-exist, thus
+	 * all compressed extents should have a checksum.
+	 */
+	if (compressed && csum_found < search_len) {
+		error(
+"root %llu EXTENT_DATA[%llu %llu] compressed extent must have csum, but only %llu bytes have, expect %llu",
+		      root->objectid, fkey.objectid, fkey.offset, csum_found,
+		      search_len);
+		err |= CSUM_ITEM_MISSING;
+	}
+	if (compressed && nodatasum) {
+		error(
+"root %llu EXTENT_DATA[%llu %llu] is compressed, but inode flag doesn't allow it",
+		      root->objectid, fkey.objectid, fkey.offset);
+		err |= FILE_EXTENT_ERROR;
+	}
+
 	/* Check EXTENT_DATA hole */
 	if (!no_holes && *end != fkey.offset) {
 		if (repair)