diff --git a/ChangeLog b/ChangeLog
index a94f22f11c..dc496a3f0f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Jul  5 15:56:06 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* numeric.c (int_pow): even number multiplication never be negative.
+
 Thu Jul  5 10:42:07 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* include/ruby/{node,ruby}.h, ruby.c: added enum constants for gdb
diff --git a/numeric.c b/numeric.c
index f3b6387bfa..eba69debb8 100644
--- a/numeric.c
+++ b/numeric.c
@@ -2304,7 +2304,7 @@ int_pow(long x, unsigned long y)
 	    z = xz;
 	}
     } while (--y);
-    if (neg) z = -z;
+    if (neg && (y & 1)) z = -z;
     return LONG2NUM(z);
 }