diff --git a/ChangeLog b/ChangeLog
index 036e26c384..297b642ae9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Jul 28 17:23:37 2005  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* parse.y (f_larglist): allow block argument in lambda parameter
+	  list without parenthesis.
+
 Thu Jul 28 17:14:01 2005  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* hash.c (each_i): typo fixed.  [ruby-dev:26622]
diff --git a/parse.y b/parse.y
index dae8ee3263..cca7eca2d6 100644
--- a/parse.y
+++ b/parse.y
@@ -3200,34 +3200,34 @@ f_larglist	: '(' f_args opt_bv_decl rparen
 			$$ = dispatch1(paren, $2);
 		    %*/
 		    }
-		| f_arg opt_bv_decl
+		| f_arg opt_f_block_arg opt_bv_decl
 		    {
 		    /*%%%*/
-			$$ = NEW_LAMBDA(new_args($1, 0, 0, 0), $2);
+			$$ = NEW_LAMBDA(new_args($1, 0, 0, $2), $3);
 		    /*%
 			$$ = dispatch4(params, $1, Qnil, Qnil, Qnil);
 		    %*/
 		    }
-		| f_arg ',' f_rest_arg opt_bv_decl
+		| f_arg ',' opt_f_block_arg f_rest_arg opt_bv_decl
 		    {
 		    /*%%%*/
-			$$ = NEW_LAMBDA(new_args($1, 0, $3, 0), $4);
+			$$ = NEW_LAMBDA(new_args($1, 0, $3, $4), $5);
 		    /*%
 			$$ = dispatch4(params, $1, Qnil, $3, Qnil);
 		    %*/
 		    }
-		| f_rest_arg opt_bv_decl
+		| f_rest_arg opt_f_block_arg opt_bv_decl
 		    {
 		    /*%%%*/
-			$$ = NEW_LAMBDA(new_args(0, 0, $1, 0), $2);
+			$$ = NEW_LAMBDA(new_args(0, 0, $1, $2), $3);
 		    /*%
 			$$ = dispatch4(params, Qnil, Qnil, $1, Qnil);
 		    %*/
 		    }
-		| opt_bv_decl
+		| opt_f_block_arg opt_bv_decl
 		    {
 		    /*%%%*/
-			$$ = NEW_LAMBDA(new_args(0, 0, 0, 0), $1);
+			$$ = NEW_LAMBDA(new_args(0, 0, 0, $1), $2);
 		    /*%
 			$$ = dispatch4(params, Qnil, Qnil, Qnil, Qnil);
 		    %*/