diff --git a/mk/px4_core.mk b/mk/px4_core.mk
index 1aef04a17b..da09efbf27 100644
--- a/mk/px4_core.mk
+++ b/mk/px4_core.mk
@@ -167,7 +167,7 @@ PARENT_MAKEFILE	:= $(lastword $(filter-out $(THIS_MAKEFILE),$(MAKEFILE_LIST)))
 include $(APPDIR)/Make.defs
 
 # this allows us to generate the main function
-SKETCHFLAGS     = -DCONFIG_HAL_BOARD=HAL_BOARD_PX4 -DSKETCHNAME=\"$(SKETCH)\" -DSKETCH_MAIN=$(SKETCH)_main
+SKETCHFLAGS     = -DCONFIG_HAL_BOARD=HAL_BOARD_PX4 -DSKETCHNAME=\"$(SKETCH)\" -DSKETCH_MAIN=$(SKETCH)_main $(EXTRAFLAGS)
 CFLAGS		+= $(SKETCHFLAGS)
 CXXFLAGS	+= $(SKETCHFLAGS)
 
diff --git a/mk/px4_targets.mk b/mk/px4_targets.mk
index 6048cd7f92..7d9a7e284e 100644
--- a/mk/px4_targets.mk
+++ b/mk/px4_targets.mk
@@ -8,7 +8,7 @@ PX4_EXTERNAL_SCRIPTS = $(HAL_PX4_DIR)/scripts/rc.APM~init.d/rc.APM
 
 # we use CURDIR instead of PWD to avoid a problem with MINGW32 on Windows
 PX4_EXTERNAL = EXTERNAL_APPS=$(CURDIR) EXTERNAL_SCRIPTS=$(PX4_EXTERNAL_SCRIPTS)
-PX4_MAKE = make -C $(PX4_ROOT) $(PX4_EXTERNAL) CONFIG_APM=y
+PX4_MAKE = make -C $(PX4_ROOT) $(PX4_EXTERNAL) CONFIG_APM=y EXTRAFLAGS=$(EXTRAFLAGS)
 
 
 px4: