diff -r eb28be8f935d -r 743814386712 make/CompileToolsHotspot.gmk
--- a/make/CompileToolsHotspot.gmk	Thu Oct 05 11:02:18 2017 +0200
+++ b/make/CompileToolsHotspot.gmk	Thu Oct 05 12:41:06 2017 +0200
@@ -35,7 +35,7 @@
 TARGETS :=
 
 # Hook to include the corresponding custom file, if present.
-$(eval $(call IncludeCustomExtension, , hotspot/CompileTools.gmk))
+$(eval $(call IncludeCustomExtension, hotspot/CompileTools.gmk))
 
 ifeq ($(INCLUDE_GRAAL), true)
   VM_CI_SRC_DIR := $(TOPDIR)/src/jdk.internal.vm.ci/share/classes