diff --git a/make/defs.mk b/make/defs.mk
index 448254d4..d801347e 100644
--- a/make/defs.mk
+++ b/make/defs.mk
@@ -91,10 +91,14 @@ USE_CFG_XXX_MK        ?= true
 ifeq ($(USE_CFG_XXX_MK),true)
 ifeq ($(DEVELOPMENT),true)
 	-include $(MODDIR)/make/defs-dev.mk
+  ifneq ($(wildcard $(TOPDIR)/make/cfg_dev.mk),)
 	-include $(TOPDIR)/make/cfg_dev.mk
+  endif
 else
 	-include $(MODDIR)/make/defs-dist.mk
+  ifneq ($(wildcard $(TOPDIR)/make/cfg_dist.mk),)
 	-include $(TOPDIR)/make/cfg_dist.mk
+  endif
 endif
 endif