diff --git a/Makefile b/Makefile
index fb716b0..c127362 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 HOSTTYPE = $(shell uname -m)
 BINDIR ?= $(HOME)/bin/$(HOSTTYPE)
-CFLAGS = -Wall
+CFLAGS += -Wall
 LDLIBS = -L/usr/X11R6/lib -lX11
 
 BINARIES = xss xsswin xcursorpos xkeygrab xbell magic xnolock