diff --git a/Zend/tests/bug71428.1.phpt b/Zend/tests/bug71428.1.phpt
index b754687560a..fbf342380ff 100644
--- a/Zend/tests/bug71428.1.phpt
+++ b/Zend/tests/bug71428.1.phpt
@@ -1,5 +1,7 @@
 --TEST--
 bug #71428.1: inheritance with null default values
+--XFAIL--
+This is a BC break
 --FILE--
 <?php
 class A {
diff --git a/Zend/tests/bug71428.3.phpt b/Zend/tests/bug71428.3.phpt
index 2f400e5952e..65d397052e4 100644
--- a/Zend/tests/bug71428.3.phpt
+++ b/Zend/tests/bug71428.3.phpt
@@ -1,5 +1,7 @@
 --TEST--
 bug #71428: Validation type inheritance with = NULL
+--XFAIL--
+This is a BC break
 --FILE--
 <?php
 class A { }
diff --git a/Zend/zend_inheritance.c b/Zend/zend_inheritance.c
index f376150f404..42283f94dca 100644
--- a/Zend/zend_inheritance.c
+++ b/Zend/zend_inheritance.c
@@ -319,10 +319,13 @@ static zend_bool zend_do_perform_implementation_check(const zend_function *fe, c
 			return 0;
 		}
 
+#if 0
+		// This introduces BC break described at https://bugs.php.net/bug.php?id=72119
 		if (proto_arg_info->type_hint && proto_arg_info->allow_null && !fe_arg_info->allow_null) {
 			/* incompatible nullability */
 			return 0;
 		}
+#endif
 
 		/* by-ref constraints on arguments are invariant */
 		if (fe_arg_info->pass_by_reference != proto_arg_info->pass_by_reference) {