diff --git a/Makefile b/Makefile
index 5f06346..8712574 100644
--- a/Makefile
+++ b/Makefile
@@ -3,14 +3,14 @@ DESTDIR ?=
 PREFIX ?= /usr/local
 
 # Build flags
-FLAGS = -std=gnu99
+OPTS = -std=gnu99
 
 # Build rules
 all: backly
 .PHONY: all install clean
 
 backly: backly.c Makefile
-	gcc $(FLAGS) -o backly backly.c
+	gcc $(OPTS) $(CFLAGS) -o backly backly.c
 
 install: backly
 	install -Dm 0755 backly $(DESTDIR)/$(PREFIX)/bin/backly