diff --git a/src/hx/gc/Immix.cpp b/src/hx/gc/Immix.cpp
index d7198276d..fb39f0a85 100644
--- a/src/hx/gc/Immix.cpp
+++ b/src/hx/gc/Immix.cpp
@@ -63,7 +63,7 @@ enum { gAlwaysMove = false };
 
 #include <hx/QuickVec.h>
 
-// #define HXCPP_GC_BIG_BLOCKS
+#define HXCPP_GC_BIG_BLOCKS
 
 
 #ifndef __has_builtin