diff --git a/Makefile b/Makefile
index d3b6e84c..09c8cd1c 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@ FILENAME = release
 endif
 
 ifeq ($(JAPANESE), 1)
-CFLAGS += -DJAPANESE
+CXXFLAGS += -DJAPANESE
 endif
 
 CXXFLAGS += `sdl2-config --cflags`