diff --git a/chunk-recover.c b/chunk-recover.c
index 8bc5bc30..b638ada6 100644
--- a/chunk-recover.c
+++ b/chunk-recover.c
@@ -42,8 +42,6 @@
 #include "btrfsck.h"
 #include "commands.h"
 
-#define BTRFS_NUM_MIRRORS			3
-
 struct recover_control {
 	int verbose;
 	int yes;
@@ -71,8 +69,8 @@ struct extent_record {
 	struct cache_extent cache;
 	u64 generation;
 	u8 csum[BTRFS_CSUM_SIZE];
-	struct btrfs_device *devices[BTRFS_NUM_MIRRORS];
-	u64 offsets[BTRFS_NUM_MIRRORS];
+	struct btrfs_device *devices[BTRFS_MAX_MIRRORS];
+	u64 offsets[BTRFS_MAX_MIRRORS];
 	int nmirrors;
 };
 
@@ -128,7 +126,7 @@ again:
 			    memcmp(exist->csum, rec->csum, BTRFS_CSUM_SIZE)) {
 				ret = -EEXIST;
 			} else {
-				BUG_ON(exist->nmirrors >= BTRFS_NUM_MIRRORS);
+				BUG_ON(exist->nmirrors >= BTRFS_MAX_MIRRORS);
 				exist->devices[exist->nmirrors] = device;
 				exist->offsets[exist->nmirrors] = offset;
 				exist->nmirrors++;
diff --git a/ctree.h b/ctree.h
index 94893388..fa73c4a4 100644
--- a/ctree.h
+++ b/ctree.h
@@ -40,6 +40,8 @@ struct btrfs_trans_handle;
 struct btrfs_free_space_ctl;
 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
 
+#define BTRFS_MAX_MIRRORS 3
+
 #define BTRFS_MAX_LEVEL 8
 
 #define BTRFS_COMPAT_EXTENT_TREE_V0