diff --git a/mrbgems/mruby-compiler/core/parse.y b/mrbgems/mruby-compiler/core/parse.y
index 8ec816a3b..e5e5d3d6d 100644
--- a/mrbgems/mruby-compiler/core/parse.y
+++ b/mrbgems/mruby-compiler/core/parse.y
@@ -10,8 +10,6 @@
 # define YYDEBUG 1
 #endif
 #define YYSTACK_USE_ALLOCA 1
-#define YYMALLOC
-#define YYFREE
 
 #include <ctype.h>
 #include <string.h>