diff --git a/src/LinearMath/btAlignedObjectArray.h b/src/LinearMath/btAlignedObjectArray.h
index d70f10862..69b54cc3d 100644
--- a/src/LinearMath/btAlignedObjectArray.h
+++ b/src/LinearMath/btAlignedObjectArray.h
@@ -28,7 +28,7 @@ subject to the following restrictions:
 
 #define BT_USE_PLACEMENT_NEW 1
 //#define BT_USE_MEMCPY 1 //disable, because it is cumbersome to find out for each platform where memcpy is defined. It can be in <memory.h> or <string.h> or otherwise...
-//#define BT_ALLOW_ARRAY_COPY_OPERATOR // enabling this can accidently perform deep copies of data if you are not careful
+#define BT_ALLOW_ARRAY_COPY_OPERATOR // enabling this can accidently perform deep copies of data if you are not careful
 
 #ifdef BT_USE_MEMCPY
 #include <memory.h>