diff --git a/ChangeLog b/ChangeLog
index 8cf02c7715..7cc0cff372 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,7 @@
-Thu Oct 23 02:25:32 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Thu Oct 23 02:33:01 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* common.mk (update-unicode): invert dependency to run every times.
+	  [ruby-core:65842] [Bug #10415]
 
 	* common.mk (after-update): update files under source tree.
 	  [ruby-core:65840] [Bug #10414]
diff --git a/common.mk b/common.mk
index 781dd8db17..d37a464486 100644
--- a/common.mk
+++ b/common.mk
@@ -1106,9 +1106,9 @@ UNICODE_FILES = $(srcdir)/enc/unicode/data/UnicodeData.txt \
 		$(srcdir)/enc/unicode/data/CompositionExclusions.txt \
 		$(srcdir)/enc/unicode/data/NormalizationTest.txt
 
-update-unicode: $(UNICODE_FILES) PHONY
+$(UNICODE_FILES): update-unicode
 
-$(UNICODE_FILES):
+update-unicode: PHONY
 	$(ECHO) Downloading Unicode data files...
 	$(Q) $(MAKEDIRS) "$(srcdir)/enc/unicode/data"
 	$(Q) $(BASERUBY) -C "$(srcdir)/enc/unicode/data" \