diff --git a/ChangeLog b/ChangeLog
index 424a83d244..2a8bbe906f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Wed Feb  4 15:55:38 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/sdbm/_sdbm.c: include ruby/ruby.h for PRIdPTRDIFF when a
+	  macro `DEBUG` is defined.  based on the patch by Owen Rodley in
+	  [ruby-core:67987]. [Bug #10825]
+
 Wed Feb  4 11:12:43 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* Makefile.in (probes.stamp): rebuild dtrace dependent objects
diff --git a/ext/sdbm/_sdbm.c b/ext/sdbm/_sdbm.c
index 3c9cb31395..a1705613a9 100644
--- a/ext/sdbm/_sdbm.c
+++ b/ext/sdbm/_sdbm.c
@@ -7,8 +7,7 @@
  * core routines
  */
 
-#include "ruby/config.h"
-#include "ruby/defines.h"
+#include "ruby/ruby.h"
 
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>