diff --git a/check/mode-lowmem.c b/check/mode-lowmem.c
index cb8e3ab8..c800aadb 100644
--- a/check/mode-lowmem.c
+++ b/check/mode-lowmem.c
@@ -28,6 +28,7 @@
 #include "check/mode-lowmem.h"
 
 static u64 last_allocated_chunk;
+static u64 total_used = 0;
 
 static int calc_extent_flag(struct btrfs_root *root, struct extent_buffer *eb,
 			    u64 *flags_ret)
@@ -3645,6 +3646,8 @@ next:
 out:
 	btrfs_release_path(&path);
 
+	total_used += used;
+
 	if (total != used) {
 		error(
 		"block group[%llu %llu] used %llu but extent items used %llu",
@@ -5547,6 +5550,14 @@ next:
 	}
 out:
 
+	if (total_used != btrfs_super_bytes_used(gfs_info->super_copy)) {
+		fprintf(stderr,
+			"super bytes_used %llu mismatches actual used %llu\n",
+			btrfs_super_bytes_used(gfs_info->super_copy),
+			total_used);
+		err |= SUPER_BYTES_USED_ERROR;
+	}
+
 	if (repair) {
 		ret = end_avoid_extents_overwrite();
 		if (ret < 0)
@@ -5559,7 +5570,7 @@ out:
 		if (ret)
 			err |= ret;
 		else
-			err &= ~BG_ACCOUNTING_ERROR;
+			err &= ~(BG_ACCOUNTING_ERROR | SUPER_BYTES_USED_ERROR);
 	}
 
 	btrfs_release_path(&path);
diff --git a/check/mode-lowmem.h b/check/mode-lowmem.h
index da9f8600..0bcc338b 100644
--- a/check/mode-lowmem.h
+++ b/check/mode-lowmem.h
@@ -48,6 +48,7 @@
 #define DIR_ITEM_HASH_MISMATCH	(1<<24) /* Dir item hash mismatch */
 #define INODE_MODE_ERROR	(1<<25) /* Bad inode mode */
 #define INVALID_GENERATION	(1<<26)	/* Generation is too new */
+#define SUPER_BYTES_USED_ERROR	(1<<27)	/* Super bytes_used is invalid */
 
 /*
  * Error bit for low memory mode check.