diff --git a/Project.xml b/Project.xml
index 6b1fec34..11abc4e3 100644
--- a/Project.xml
+++ b/Project.xml
@@ -171,5 +171,6 @@
 	<haxedef name="HXCPP_CHECK_POINTER" if="release" />
 	<haxedef name="HXCPP_STACK_LINE" if="release" />
 	<haxedef name="HXCPP_DEBUG_LINK" if="release" />
+	<haxedef name="HXCPP_GC_BIG_BLOCKS" />
 	<haxedef name="hscriptPos" /> <!-- for logging -->
 </project>