diff --git a/.gitignore b/.gitignore
index d03d1485..c1743e26 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 make-bcache
 probe-bcache
 .*
+*.o
diff --git a/bcache.h b/bcache.h
index e3c10ca5..d91b3e18 100644
--- a/bcache.h
+++ b/bcache.h
@@ -38,7 +38,7 @@ struct cache_sb {
 
 	uint16_t		first_bucket;
 	uint16_t		keys;		/* number of journal buckets */
-	uint64_t		d[512];		/* journal buckets */
+	uint64_t		d[];		/* journal buckets */
 };
 
 inline uint64_t crc64(const void *_data, size_t len);