--- a/make/SourceRevision.gmk	Thu Oct 05 11:02:18 2017 +0200
+++ b/make/SourceRevision.gmk	Thu Oct 05 12:41:06 2017 +0200
@@ -28,7 +28,7 @@
 include $(SPEC)
 include MakeBase.gmk
 
-$(eval $(call IncludeCustomExtension, , SourceRevision.gmk))
+$(eval $(call IncludeCustomExtension, SourceRevision.gmk))
 
 ################################################################################
 # Keep track of what source revision is used to create the build, by creating