diff --git a/source/m3_config.h b/source/m3_config.h
index a2810f5..e9a6837 100644
--- a/source/m3_config.h
+++ b/source/m3_config.h
@@ -43,7 +43,7 @@
 # endif
 
 # ifndef d_m3Use32BitSlots
-#   define d_m3Use32BitSlots                    0
+#   define d_m3Use32BitSlots                    1
 # endif
 
 //# ifndef d_m3EnableOptimizations