diff --git a/Makefile b/Makefile
index 4f00bdd3d6..fe30be38dc 100644
--- a/Makefile
+++ b/Makefile
@@ -259,7 +259,7 @@ lib/tclIndex: $(ALL_LIBFILES) GIT-GUI-VARS
 	 rm -f $@ ; \
 	 echo '# Autogenerated by git-gui Makefile' >$@ && \
 	 echo >>$@ && \
-	 $(foreach p,$(PRELOAD_FILES) $(ALL_LIBFILES),echo '$(subst lib/,,$p)' >>$@ &&) \
+	 $(foreach p,$(PRELOAD_FILES) $(sort $(ALL_LIBFILES)),echo '$(subst lib/,,$p)' >>$@ &&) \
 	 echo >>$@ ; \
 	fi