diff --git a/make/projects-dir-minimal.mk b/make/projects-dir-minimal.mk
index 7d68d7fc..00dce372 100644
--- a/make/projects-dir-minimal.mk
+++ b/make/projects-dir-minimal.mk
@@ -44,7 +44,7 @@ $(JWBDIR):
 all: link-makefile.done
 link-makefile.done: | $(JWBDIR)
 	[ -L $(PROJECTS_MAKEFILE_NAME) ] || \
-		ln -sf `find $(JWBDIR) -name '*.mk' -print0 | xargs -0 grep -l some-random-string-to-id-this-makefile` \
+		ln -sf `git -C $(JWBDIR) ls-files | sed '/\.mk$$/ !d; s|^|$(JWBDIR)/|' | xargs grep -l some-random-string-to-id-this-makefile` \
 			$(PROJECTS_MAKEFILE_NAME)
 	touch $@
 clean: clean.link-makefile