--- a/make/common/MakeBase.gmk	Thu Oct 05 11:02:18 2017 +0200
+++ b/make/common/MakeBase.gmk	Thu Oct 05 12:41:06 2017 +0200
@@ -991,6 +991,6 @@
 ################################################################################
 
 # Hook to include the corresponding custom file, if present.
-$(eval $(call IncludeCustomExtension, , common/MakeBase.gmk))
+$(eval $(call IncludeCustomExtension, common/MakeBase.gmk))
 
 endif # _MAKEBASE_GMK