diff --git a/Makefile b/Makefile
index 2459352..b0ee31b 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ VERSION = 0.9
 CC = gcc
 DESTDIR =
 PREFIX = /usr/local
-CFLAGS = -Wall -pedantic -O2 -DVERSION=\"$(VERSION)\"
+CFLAGS+= -Wall -pedantic -O2 -DVERSION=\"$(VERSION)\"
 LDFLAGS =
 LIBS = -lX11 -lImlib2