diff --git a/ChangeLog b/ChangeLog
index aa18e2aa50..973c2b0c2e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Aug 18 15:52:50 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* insnhelper.ci (vm_send_optimize): use MEMMOVE to shift values inside
+	  an array.
+
 Sat Aug 18 15:45:34 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* insnhelper.ci (vm_yield_setup_args): rsize and psize should not be
diff --git a/insnhelper.ci b/insnhelper.ci
index 369aeef251..500005c9ce 100644
--- a/insnhelper.ci
+++ b/insnhelper.ci
@@ -591,7 +591,7 @@ vm_send_optimize(rb_control_frame_t *reg_cfp,
 
 	    /* shift arguments */
 	    if (i > 0) {
-		MEMCPY(&TOPN(i), &TOPN(i-1), VALUE, i);
+		MEMMOVE(&TOPN(i), &TOPN(i-1), VALUE, i);
 	    }
 
 	    *mn = rb_method_node(klass, *id);