diff --git a/Makefile b/Makefile
index 0dcad36d..100c71f0 100644
--- a/Makefile
+++ b/Makefile
@@ -24,7 +24,7 @@ include ${BUILDDIR}/config.mak
 
 PROG=${BUILDDIR}/tvheadend
 
-CFLAGS  = -Wall -Werror -Wwrite-strings -Wno-deprecated-declarations 
+CFLAGS += -Wall -Werror -Wwrite-strings -Wno-deprecated-declarations
 CFLAGS += -Wmissing-prototypes
 LDFLAGS += -lrt -ldl