diff --git a/common.mk b/common.mk
index 7ed419b097..46278a7079 100644
--- a/common.mk
+++ b/common.mk
@@ -1095,6 +1095,8 @@ update-unicode: PHONY
 	    ../../../tool/downloader.rb unicode \
 	    UnicodeData.txt CompositionExclusions.txt NormalizationTest.txt
 
+enc/unicode/data/UnicodeData.txt: update-unicode
+
 lib/unicode_normalize/tables.rb: tool/unicode_norm_gen.rb \
 enc/unicode/data/UnicodeData.txt \
 enc/unicode/data/CompositionExclusions.txt