diff --git a/optimizer.c b/optimizer.c
index 4f58177..6ecee39 100644
--- a/optimizer.c
+++ b/optimizer.c
@@ -556,7 +556,7 @@ static int xc_optimize_op_array(zend_op_array *op_array TSRMLS_DC) /* {{{ */
 	return 0;
 }
 /* }}} */
-int xc_clear_flag_optimized(zend_op_array *op_array TSRMLS_DC) /* {{{ */
+static int xc_clear_flag_optimized(zend_op_array *op_array TSRMLS_DC) /* {{{ */
 {
 	op_array->done_pass_two = 0;
 	return 0;