diff --git a/ChangeLog b/ChangeLog
index 27b63e351b..a16e50fafa 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Dec  6 19:52:50 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* parse.y (arg): typo fixed ("!" -> "|") in the ripper code.
+
 Thu Dec  6 19:48:41 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* parse.y (arg): tUPLUS no longer works as identity operation any
diff --git a/parse.y b/parse.y
index 4698c35bfb..78cae5a367 100644
--- a/parse.y
+++ b/parse.y
@@ -2053,7 +2053,7 @@ arg		: lhs '=' arg
 		    /*%%%*/
 			$$ = call_bin_op($1, '|', $3);
 		    /*%
-			$$ = dispatch3(binary, $1, ID2SYM('!'), $3);
+			$$ = dispatch3(binary, $1, ID2SYM('|'), $3);
 		    %*/
 		    }
 		| arg '^' arg