diff --git a/Makefile b/Makefile
index 6164d5b..a0682a9 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,9 @@
 ifneq ($(OS),Windows_NT)
-	DEFS = -D_POSIX_C_SOURCE=200112L
+CPPFLAGS = -D_POSIX_C_SOURCE=200112L
 endif
-CFLAGS  = $(DEFS) -ggdb -std=c11 -Wall -Wextra -pedantic -Wmissing-prototypes -Wstrict-prototypes -Wold-style-definition
-#CFLAGS  = $(DEFS) -pg -std=c11 -Wall -Wextra -pedantic -Wmissing-prototypes -Wstrict-prototypes -Wold-style-definition
-#CFLAGS  = $(DEFS) -O3 -std=c11 -Wall -Wextra -pedantic -Wmissing-prototypes -Wstrict-prototypes -Wold-style-definition
+CFLAGS  = -ggdb -std=c11 -Wall -Wextra -pedantic -Wmissing-prototypes -Wstrict-prototypes -Wold-style-definition
+#CFLAGS  = -pg -std=c11 -Wall -Wextra -pedantic -Wmissing-prototypes -Wstrict-prototypes -Wold-style-definition
+#CFLAGS  = -O3 -std=c11 -Wall -Wextra -pedantic -Wmissing-prototypes -Wstrict-prototypes -Wold-style-definition
 LDFLAGS = -lm
 SOURCE  = main.c util.c tok.c lex.c ir.c parse.c runtime.c vm.c map.c
 HEADERS =        util.h tok.h lex.h ir.h parse.h runtime.h vm.h map.h
@@ -15,7 +15,7 @@ $(EXE): $(OBJ)
 	$(CC) -o $@ $^ $(CFLAGS) $(LDFLAGS)
 
 %.o: %.c
-	$(CC) -c -o $@ $< $(CFLAGS)
+	$(CC) -c -o $@ $< $(CPPFLAGS) $(CFLAGS)
 
 deps.mk: $(SOURCE) $(HEADERS)
 	@echo "# Automatically generated by $(CC) -MM." > $@