diff --git a/ChangeLog b/ChangeLog
index 882413f4c4..48bf85cb41 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Dec 12 22:12:46 2008  Tadayoshi Funaba  <tadf@dotrb.org>
+
+	* complex.c, rational.c: do not use RUBY_VERSION_CODE.
+
 Fri Dec 12 21:41:36 2008  TAKAO Kouji  <kouji@takao7.net>
 
 	* ext/readline/readline.c: r20662 reverted.
diff --git a/complex.c b/complex.c
index a7c01da670..0549bab87a 100644
--- a/complex.c
+++ b/complex.c
@@ -320,18 +320,17 @@ f_complex_new_bang2(VALUE klass, VALUE x, VALUE y)
     return nucomp_s_new_internal(klass, x, y);
 }
 
-#define RUBY_VERSION_CODE 0
-
-#if RUBY_VERSION_CODE < 200
 #define CANON
-#endif
-
 #ifdef CANON
 static int canonicalization = 0;
 
 void
 nucomp_canonicalize(int f)
 {
+    VALUE s = rb_const_get(rb_cObject, rb_intern("RUBY_VERSION"));
+    Check_Type(s, T_STRING);
+    if (rb_str_cmp(s, rb_str_new2("2.0.0")) >= 0)
+	rb_bug("no longer provide canonicalization");
     canonicalization = f;
 }
 #endif
diff --git a/rational.c b/rational.c
index ac28822bdd..4b6e2ea0ca 100644
--- a/rational.c
+++ b/rational.c
@@ -377,18 +377,17 @@ f_rational_new_bang2(VALUE klass, VALUE x, VALUE y)
     return nurat_s_new_internal(klass, x, y);
 }
 
-#define RUBY_VERSION_CODE 0
-
-#if RUBY_VERSION_CODE < 200
 #define CANON
-#endif
-
 #ifdef CANON
 static int canonicalization = 0;
 
 void
 nurat_canonicalize(int f)
 {
+    VALUE s = rb_const_get(rb_cObject, rb_intern("RUBY_VERSION"));
+    Check_Type(s, T_STRING);
+    if (rb_str_cmp(s, rb_str_new2("2.0.0")) >= 0)
+	rb_bug("no longer provide canonicalization");
     canonicalization = f;
 }
 #endif