diff --git a/metadata.cc b/metadata.cc
index 7dfc787..20c0a0d 100644
--- a/metadata.cc
+++ b/metadata.cc
@@ -220,7 +220,7 @@
 
     // Due to bsdiff slowness, we're going to break each block group down
     // into metadata chunks and feed them to bsdiff.
-    __u32 num_chunks = 10;
+    __u32 num_chunks = 4;
     __u32 blocks_per_chunk = num_metadata_blocks / num_chunks;
     __u32 curr_block = bg_start_block;
     for (__u32 chunk = 0; chunk < num_chunks; chunk++) {