diff --git a/Makefile b/Makefile
index 75f6779..066408c 100644
--- a/Makefile
+++ b/Makefile
@@ -53,7 +53,7 @@ INST_HEADERS:=kernel.h user.h fasthdlc.h wctdm_user.h dahdi_config.h
 
 DAHDI_BUILD_ALL:=m
 
-KMAKE=+$(MAKE) -C $(KSRC) KBUILD_EXTMOD=$(PWD)/drivers/dahdi DAHDI_INCLUDE=$(PWD)/include DAHDI_MODULES_EXTRA="$(DAHDI_MODULES_EXTRA)" HOTPLUG_FIRMWARE=$(HOTPLUG_FIRMWARE)
+KMAKE=+$(MAKE) -C $(KSRC) M=$(PWD)/drivers/dahdi DAHDI_INCLUDE=$(PWD)/include DAHDI_MODULES_EXTRA="$(DAHDI_MODULES_EXTRA)" HOTPLUG_FIRMWARE=$(HOTPLUG_FIRMWARE)
 
 ROOT_PREFIX:=
 
diff --git a/drivers/dahdi/datamods/Makefile b/drivers/dahdi/datamods/Makefile
index 5d63668..c4679bd 100644
--- a/drivers/dahdi/datamods/Makefile
+++ b/drivers/dahdi/datamods/Makefile
@@ -8,7 +8,7 @@ PWD=$(shell pwd)
 
 MODULESO:=$(MODULES:%=%.o)
 MODULESKO:=$(MODULES:%=%.ko)
-KMAKE = $(MAKE) -C $(KSRC) KBUILD_EXTMOD=$(PWD)
+KMAKE = $(MAKE) -C $(KSRC) M=$(PWD)
 KMAKE_INST = $(KMAKE) \
   INSTALL_MOD_PATH=$(INSTALL_PREFIX) INSTALL_MOD_DIR=misc modules_install