diff --git a/daemon/Makefile b/daemon/Makefile
index 8d99e93a6..841aef72f 100644
--- a/daemon/Makefile
+++ b/daemon/Makefile
@@ -4,7 +4,8 @@ with_iptables_option ?= yes
 with_transcoding ?= yes
 
 
-CFLAGS+=	-g -Wall -Wstrict-prototypes -pthread -fno-strict-aliasing
+CFLAGS?=	-g -Wall -Wstrict-prototypes
+CFLAGS+=	-pthread -fno-strict-aliasing
 CFLAGS+=	-std=c99
 CFLAGS+=	$(shell pkg-config --cflags glib-2.0)
 CFLAGS+=	$(shell pkg-config --cflags gthread-2.0)
diff --git a/iptables-extension/Makefile b/iptables-extension/Makefile
index 61c5aef5d..6b6ea0c0c 100644
--- a/iptables-extension/Makefile
+++ b/iptables-extension/Makefile
@@ -1,5 +1,6 @@
 CC?=gcc
-CFLAGS		= -O2 -Wall -Wstrict-prototypes -shared -fPIC
+CFLAGS		?= -O2 -Wall -Wstrict-prototypes
+CFLAGS		+= -shared -fPIC
 ifneq ($(RTPENGINE_VERSION),)
   CFLAGS	+= -DRTPENGINE_VERSION="\"$(RTPENGINE_VERSION)\""
 else
diff --git a/recording-daemon/Makefile b/recording-daemon/Makefile
index b5f7c585d..b0e514510 100644
--- a/recording-daemon/Makefile
+++ b/recording-daemon/Makefile
@@ -1,6 +1,7 @@
 TARGET=		rtpengine-recording
 
-CFLAGS+=	-g -Wall -Wstrict-prototypes -pthread -I. -I../lib/ -I../kernel-module/
+CFLAGS?=	-g -Wall -Wstrict-prototypes
+CFLAGS+=	-pthread -I. -I../lib/ -I../kernel-module/
 CFLAGS+=	-std=c99 -fno-strict-aliasing
 CFLAGS+=	-D_GNU_SOURCE -D_POSIX_SOURCE -D_POSIX_C_SOURCE
 CFLAGS+=	$(shell pkg-config --cflags glib-2.0)
diff --git a/t/Makefile b/t/Makefile
index c7732e3ab..ce548352d 100644
--- a/t/Makefile
+++ b/t/Makefile
@@ -2,7 +2,8 @@ TARGET=		all-tests
 
 with_transcoding ?= yes
 
-CFLAGS=		-g -Wall -Wstrict-prototypes -pthread -fno-strict-aliasing
+CFLAGS?=	-g -Wall -Wstrict-prototypes
+CFLAGS+=	-pthread -fno-strict-aliasing
 CFLAGS+=	-std=c99
 CFLAGS+=	$(shell pkg-config --cflags glib-2.0)
 CFLAGS+=	$(shell pkg-config --cflags gthread-2.0)