diff --git a/ChangeLog b/ChangeLog
index e6b8b074a1..ca5df63d4b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Wed Dec 10 23:58:56 2008  Tadayoshi Funaba  <tadf@dotrb.org>
+
+	* complex.c: avoided warnings on cpp.
+
+	* rational.c: ditto.
+
 Wed Dec 10 21:32:02 2008  Kouhei Sutou  <kou@cozmixng.org>
 
 	* lib/rss/maker.rb (RSS::Maker.[]): add.
diff --git a/complex.c b/complex.c
index f69c976ac0..6dc09526d5 100644
--- a/complex.c
+++ b/complex.c
@@ -320,6 +320,10 @@ f_complex_new_bang2(VALUE klass, VALUE x, VALUE y)
     return nucomp_s_new_internal(klass, x, y);
 }
 
+#ifndef RUBY_VERSION_CODE
+#include "version.h"
+#endif
+
 #if RUBY_VERSION_CODE < 200
 #define CANON
 #endif
@@ -1427,6 +1431,10 @@ Init_Complex(void)
     rb_undef_method(rb_cComplex, "step");
     rb_undef_method(rb_cComplex, "truncate");
 
+#ifndef NUBY
+#define NUBY 0
+#endif
+
 #if NUBY
     rb_undef_method(rb_cComplex, "//");
 #endif
diff --git a/rational.c b/rational.c
index 3c29aab973..82628594d3 100644
--- a/rational.c
+++ b/rational.c
@@ -377,6 +377,10 @@ f_rational_new_bang2(VALUE klass, VALUE x, VALUE y)
     return nurat_s_new_internal(klass, x, y);
 }
 
+#ifndef RUBY_VERSION_CODE
+#include "version.h"
+#endif
+
 #if RUBY_VERSION_CODE < 200
 #define CANON
 #endif
@@ -1541,9 +1545,15 @@ Init_Rational(void)
     rb_define_method(rb_cRational, "coerce", nurat_coerce, 1);
 
     rb_define_method(rb_cRational, "div", nurat_idiv, 1);
+
+#ifndef NUBY
+#define NUBY 0
+#endif
+
 #if NUBY
     rb_define_method(rb_cRational, "//", nurat_idiv, 1);
 #endif
+
     rb_define_method(rb_cRational, "modulo", nurat_mod, 1);
     rb_define_method(rb_cRational, "%", nurat_mod, 1);
     rb_define_method(rb_cRational, "divmod", nurat_divmod, 1);