diff --git a/make/depend.mk b/make/depend.mk
index e4054557..e0d86647 100644
--- a/make/depend.mk
+++ b/make/depend.mk
@@ -1,7 +1,7 @@
 # variables
 DEPEND_CFLAGS   += -D__MAKEDEPEND__
 DEPEND_CPPFLAGS += -D__MAKEDEPEND__
-DEPEND_MK        = $(addprefix .,$(addsuffix .dep.mk, $(OBJ)))
+DEPEND_MK       += $(addprefix .,$(addsuffix .dep.mk, $(OBJ)))
 
 # mandatory target behaviour
 all: