diff --git a/ChangeLog b/ChangeLog
index 47879d160d..8988570a13 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Jan 29 19:22:45 2014  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* enumerator.c: include internal.h instead of declaring the external
+	  function there.
+
 Wed Jan 29 18:52:09 2014  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* enumerator.c (enumerator_with_index_i): add the declaration of
diff --git a/common.mk b/common.mk
index e48cdc5776..b26ba729c3 100644
--- a/common.mk
+++ b/common.mk
@@ -619,7 +619,8 @@ encoding.$(OBJEXT): {$(VPATH)}encoding.c $(RUBY_H_INCLUDES) \
   {$(VPATH)}internal.h
 enum.$(OBJEXT): {$(VPATH)}enum.c $(RUBY_H_INCLUDES) {$(VPATH)}node.h \
   {$(VPATH)}util.h $(ID_H_INCLUDES)
-enumerator.$(OBJEXT): {$(VPATH)}enumerator.c $(RUBY_H_INCLUDES) {$(VPATH)}node.h
+enumerator.$(OBJEXT): {$(VPATH)}enumerator.c $(RUBY_H_INCLUDES) \
+  {$(VPATH)}node.h {$(VPATH)}internal.h
 error.$(OBJEXT): {$(VPATH)}error.c {$(VPATH)}known_errors.inc \
   $(RUBY_H_INCLUDES) $(VM_CORE_H_INCLUDES) $(ENCODING_H_INCLUDES) \
   {$(VPATH)}debug.h \
diff --git a/enumerator.c b/enumerator.c
index 65247c90d5..bf0abf62f2 100644
--- a/enumerator.c
+++ b/enumerator.c
@@ -14,6 +14,7 @@
 
 #include "ruby/ruby.h"
 #include "node.h"
+#include "internal.h"
 
 /*
  * Document-class: Enumerator
@@ -366,8 +367,6 @@ enumerator_each(VALUE obj)
     return enumerator_block_call(obj, 0, obj);
 }
 
-extern VALUE rb_int_succ(VALUE);
-
 static VALUE
 enumerator_with_index_i(VALUE val, VALUE m, int argc, VALUE *argv)
 {
diff --git a/version.h b/version.h
index 1c2329885f..f10aeae754 100644
--- a/version.h
+++ b/version.h
@@ -1,5 +1,5 @@
 #define RUBY_VERSION "1.9.3"
-#define RUBY_PATCHLEVEL 502
+#define RUBY_PATCHLEVEL 503
 
 #define RUBY_RELEASE_DATE "2014-01-29"
 #define RUBY_RELEASE_YEAR 2014