--- old/make/gendata/Gendata-java.base.gmk	2017-10-05 11:56:03.032732849 +0200
+++ new/make/gendata/Gendata-java.base.gmk	2017-10-05 11:56:02.784736764 +0200
@@ -26,7 +26,7 @@
 include GendataCommon.gmk
 
 # Hook to include the corresponding custom file, if present.
-$(eval $(call IncludeCustomExtension, , gendata/Gendata-java.base.gmk))
+$(eval $(call IncludeCustomExtension, gendata/Gendata-java.base.gmk))
 
 include GendataBreakIterator.gmk