diff --git a/ext/filter/logical_filters.c b/ext/filter/logical_filters.c
index 9b436a779e6..b8df2183b9d 100644
--- a/ext/filter/logical_filters.c
+++ b/ext/filter/logical_filters.c
@@ -837,7 +837,7 @@ void php_filter_validate_mac(PHP_INPUT_FILTER_PARAM_DECL) /* {{{ */
 			/* The current token did not end with e.g. a "." */
 			RETURN_VALIDATION_FAILED
 		}
-		if (php_filter_parse_hex(input + offset, length, &ret) < 0) {
+		if (php_filter_parse_hex(input + offset, length, &ret TSRMLS_CC) < 0) {
 			/* The current token is no valid hexadecimal digit */
 			RETURN_VALIDATION_FAILED
 		}