diff --git a/ChangeLog b/ChangeLog
index eb11a230cc..8ef569c68d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Nov  3 09:43:30 2014  SHIBATA Hiroshi  <shibata.hiroshi@gmail.com>
+
+	* vm_args.c: fixed build error with clang
+
 Mon Nov  3 09:32:46 2014  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* lib/uri/rfc3986_parser.rb (URI::RFC3986_Parser::RFC3986_URI):
diff --git a/vm_args.c b/vm_args.c
index c1f460a972..989fc10cc0 100644
--- a/vm_args.c
+++ b/vm_args.c
@@ -574,7 +574,7 @@ setup_parameters_complex(rb_thread_t * const th, const rb_iseq_t * const iseq, r
 	     iseq->param.opt_num > 2 || iseq->param.flags.has_kw || iseq->param.flags.has_kwrest) && /* TODO: can be shrink with flags */
 	    !iseq->param.flags.ambiguous_param0 &&
 	    args_check_block_arg0(args, th, msl)) {
-	    given_argc = RARRAY_LEN(args->rest);
+	    given_argc = RARRAY_LENINT(args->rest);
 	}
 	break;
       case arg_setup_lambda:
@@ -582,7 +582,7 @@ setup_parameters_complex(rb_thread_t * const th, const rb_iseq_t * const iseq, r
 	    given_argc != iseq->param.lead_num &&
 	    !iseq->param.flags.has_rest &&
 	    args_check_block_arg0(args, th, msl)) {
-	    given_argc = RARRAY_LEN(args->rest);
+	    given_argc = RARRAY_LENINT(args->rest);
 	}
     }