diff --git a/ChangeLog b/ChangeLog
index 8de335178a..b1f06eb0c3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Jan 22 14:26:36 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* common.mk (rdoc): needs encodings and exts.
+
 Fri Jan 22 14:16:18 2010  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* configure.in: add missing comma.
diff --git a/common.mk b/common.mk
index 8d567257d0..63a24e2add 100644
--- a/common.mk
+++ b/common.mk
@@ -349,7 +349,7 @@ do-install-doc: $(PROGRAM)
 post-install-doc::
 	@$(NULLCMD)
 
-rdoc: $(PROGRAM) PHONY
+rdoc: main PHONY
 	@echo Generating RDoc documentation
 	$(XRUBY) "$(srcdir)/bin/rdoc" --all --ri --op "$(RDOCOUT)" "$(srcdir)"
 nodoc: PHONY