diff --git a/ChangeLog b/ChangeLog
index 332821c81b..f2f1186be3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Aug 13 17:42:34 2015  Koichi Sasada  <ko1@atdot.net>
+
+	* vm_core.h (rb_call_info_kw_arg_bytes): move the definition
+	  to iseq.h because this function is shared with iseq.c and compile.c.
+
 Thu Aug 13 14:36:31 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* object.c (rb_num_to_dbl): move from num2dbl_with_to_f in math.c.
diff --git a/iseq.h b/iseq.h
index eca85cb9fd..315a73f3c7 100644
--- a/iseq.h
+++ b/iseq.h
@@ -12,6 +12,12 @@
 #ifndef RUBY_COMPILE_H
 #define RUBY_COMPILE_H
 
+static inline size_t
+rb_call_info_kw_arg_bytes(int keyword_len)
+{
+    return sizeof(rb_call_info_kw_arg_t) + sizeof(VALUE) * (keyword_len - 1);
+}
+
 RUBY_SYMBOL_EXPORT_BEGIN
 
 /* compile.c */
diff --git a/vm_core.h b/vm_core.h
index 67458372c0..a032daa2ad 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -180,12 +180,6 @@ typedef struct rb_call_info_kw_arg_struct {
     VALUE keywords[1];
 } rb_call_info_kw_arg_t;
 
-static inline size_t
-rb_call_info_kw_arg_bytes(int keyword_len)
-{
-    return sizeof(rb_call_info_kw_arg_t) + sizeof(VALUE) * (keyword_len - 1);
-}
-
 enum method_missing_reason {
     MISSING_NOENTRY   = 0x00,
     MISSING_PRIVATE   = 0x01,