diff --git a/Zend/tests/gh18572.phpt b/Zend/tests/gh18572.phpt
index 46361abe966..5b877d74572 100644
--- a/Zend/tests/gh18572.phpt
+++ b/Zend/tests/gh18572.phpt
@@ -36,4 +36,4 @@ try {
 }
 ?>
 --EXPECTREGEX--
-(Maximum call stack size reached during object comparison|Fatal error: Nesting level too deep - recursive dependency?.+)
+(Maximum call stack size reached during object comparison|Fatal error: Nesting level too deep - recursive dependency\?.+)