diff --git a/ChangeLog b/ChangeLog
index ce4e4dc8b3..95d05890bc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed Nov 21 21:53:29 2012  Tadayoshi Funaba  <tadf@dotrb.org>
+
+	* complex.c (nucomp_to_c): added.
+
 Wed Nov 21 21:35:38 2012  Tadayoshi Funaba  <tadf@dotrb.org>
 
 	* include/ruby/util.h: removed extra semicolon in definition of
diff --git a/complex.c b/complex.c
index d262e9a325..1d61fda950 100644
--- a/complex.c
+++ b/complex.c
@@ -1472,6 +1472,21 @@ nucomp_rationalize(int argc, VALUE *argv, VALUE self)
     return rb_funcall2(dat->real, rb_intern("rationalize"), argc, argv);
 }
 
+/*
+ * call-seq:
+ *    complex.to_c  ->  self
+ *
+ * Returns self.
+ *
+ *    Complex(2).to_c      #=> (2+0i)
+ *    Complex(-8, 6).to_c  #=> (-8+6i)
+ */
+static VALUE
+nucomp_to_c(VALUE self)
+{
+    return self;
+}
+
 /*
  * call-seq:
  *    nil.to_c  ->  (0+0i)
@@ -2178,6 +2193,7 @@ Init_Complex(void)
     rb_define_method(rb_cComplex, "to_f", nucomp_to_f, 0);
     rb_define_method(rb_cComplex, "to_r", nucomp_to_r, 0);
     rb_define_method(rb_cComplex, "rationalize", nucomp_rationalize, -1);
+    rb_define_method(rb_cComplex, "to_c", nucomp_to_c, 0);
     rb_define_method(rb_cNilClass, "to_c", nilclass_to_c, 0);
     rb_define_method(rb_cNumeric, "to_c", numeric_to_c, 0);