diff --git a/ChangeLog b/ChangeLog
index 76f1211c56..972226a404 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Jun 10 20:55:57 2008  Tadayoshi Funaba  <tadf@dotrb.org>
+
+	* complex.c (nucomp_s_convert): need not to initialize optional
+	  argument for rb_scan_args().
+
 Tue Jun 10 20:13:56 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/extmk.rb: negate default of --without-ext if --with-ext is
diff --git a/complex.c b/complex.c
index 7f99ade0a7..d679568df8 100644
--- a/complex.c
+++ b/complex.c
@@ -1289,8 +1289,6 @@ nucomp_s_convert(int argc, VALUE *argv, VALUE klass)
 {
     VALUE a1, a2;
 
-    a1 = Qnil;
-    a2 = Qnil;
     rb_scan_args(argc, argv, "02", &a1, &a2);
 
     switch (TYPE(a1)) {