diff --git a/Makefile b/Makefile
index db51d1932..ab5941bfc 100644
--- a/Makefile
+++ b/Makefile
@@ -87,19 +87,15 @@ $(eval $(call validate-option,VERSION,jp us eu sh))
 
 ifeq      ($(VERSION),jp)
   DEFINES   += VERSION_JP=1
-  OPT_FLAGS := -g
   GRUCODE   ?= f3dzex
 else ifeq ($(VERSION),us)
   DEFINES   += VERSION_US=1
-  OPT_FLAGS := -g
   GRUCODE   ?= f3dzex
 else ifeq ($(VERSION),eu)
   DEFINES   += VERSION_EU=1
-  OPT_FLAGS := -O2
   GRUCODE   ?= f3dzex
 else ifeq ($(VERSION),sh)
   DEFINES   += VERSION_SH=1
-  OPT_FLAGS := -O2
   GRUCODE   ?= f3dzex
 endif