diff --git a/CHANGES b/CHANGES
index aab94343c..45ed22e36 100644
--- a/CHANGES
+++ b/CHANGES
@@ -33,6 +33,7 @@ Misc:
  - Qt: Make "Mute" able to be bound to a key
  - Qt: Add .gb/.gbc files to the extension list in Info.plist
  - Feature: Make -l option explicit
+ - Util: Tune patch-fast extent sizes
 
 0.5.2: (2016-12-31)
 Bugfixes:
diff --git a/src/util/patch-fast.h b/src/util/patch-fast.h
index 34988160c..88d3e33c6 100644
--- a/src/util/patch-fast.h
+++ b/src/util/patch-fast.h
@@ -11,7 +11,7 @@
 #include "util/patch.h"
 #include "util/vector.h"
 
-#define PATCH_FAST_EXTENT 256
+#define PATCH_FAST_EXTENT 128
 
 struct PatchFastExtent {
 	size_t length;