diff --git a/ChangeLog b/ChangeLog
index 617adde24b..ca3e89ae75 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Fri Dec 19 22:10:00 2014  Kenta Murata  <mrkn@cookpad.com>
+
+	* ext/bigdecimal/depend: Fix dependencies to make bigdecimal
+	  installable by rubygems.
+
+	* ext/bigdecimal/bigdecimal.gemspec: version 1.2.6.
+
 Fri Dec 19 20:00:19 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* include/ruby/ruby.h (PRIsVALUE): put a space after string
diff --git a/ext/bigdecimal/bigdecimal.gemspec b/ext/bigdecimal/bigdecimal.gemspec
index e4f58c1adf..197bdea18f 100644
--- a/ext/bigdecimal/bigdecimal.gemspec
+++ b/ext/bigdecimal/bigdecimal.gemspec
@@ -1,5 +1,5 @@
 # -*- ruby -*-
-_VERSION = "1.2.5"
+_VERSION = "1.2.6"
 date = %w$Date::                           $[1]
 
 Gem::Specification.new do |s|
diff --git a/ext/bigdecimal/depend b/ext/bigdecimal/depend
index a7b84c9e97..d9c6600b80 100644
--- a/ext/bigdecimal/depend
+++ b/ext/bigdecimal/depend
@@ -7,7 +7,7 @@ bigdecimal.o: $(hdrdir)/ruby/missing.h
 bigdecimal.o: $(hdrdir)/ruby/st.h
 bigdecimal.o: $(hdrdir)/ruby/subst.h
 bigdecimal.o: $(hdrdir)/ruby/util.h
-bigdecimal.o: $(top_srcdir)/include/ruby/ruby.h
+bigdecimal.o: $(hdrdir)/ruby/ruby.h
 bigdecimal.o: bigdecimal.c
 bigdecimal.o: bigdecimal.h
 # AUTOGENERATED DEPENDENCIES END