diff --git a/common.mk b/common.mk
index 46278a7079..5dbd916c6d 100644
--- a/common.mk
+++ b/common.mk
@@ -1092,7 +1092,7 @@ update-gems: PHONY
 update-unicode: PHONY
 	$(ECHO) Downloading Unicode data files...
 	$(Q) $(BASERUBY) -C "$(srcdir)/enc/unicode/data" \
-	    ../../../tool/downloader.rb unicode \
+	    ../../../tool/downloader.rb -e unicode \
 	    UnicodeData.txt CompositionExclusions.txt NormalizationTest.txt
 
 enc/unicode/data/UnicodeData.txt: update-unicode