diff --git a/src/gos/sys_make.mk b/src/gos/sys_make.mk
index 8ef22121..9e24f875 100644
--- a/src/gos/sys_make.mk
+++ b/src/gos/sys_make.mk
@@ -4,4 +4,5 @@ GFXSRC +=   $(GFXLIB)/src/gos/chibios.c	\
 			$(GFXLIB)/src/gos/linux.c \
 			$(GFXLIB)/src/gos/osx.c \
 			$(GFXLIB)/src/gos/raw32.c \
+			$(GFXLIB)/src/gos/ecos.c