diff --git a/Zend/tests/type_declarations/typed_properties_protected_inheritance_mismatch.phpt b/Zend/tests/type_declarations/typed_properties_protected_inheritance_mismatch.phpt
new file mode 100644
index 00000000000..1f03b5580f4
--- /dev/null
+++ b/Zend/tests/type_declarations/typed_properties_protected_inheritance_mismatch.phpt
@@ -0,0 +1,11 @@
+--TEST--
+Typed property invariance violation for protected properties
+--FILE--
+<?php
+
+class A { protected int $x; }
+class B extends A { protected $x; }
+
+?>
+--EXPECTF--
+Fatal error: Type of B::$x must be int (as in class A) in %s on line %d
diff --git a/Zend/zend_inheritance.c b/Zend/zend_inheritance.c
index 1a27bbdfb6c..220df561a2b 100644
--- a/Zend/zend_inheritance.c
+++ b/Zend/zend_inheritance.c
@@ -976,7 +976,7 @@ static void emit_incompatible_property_error(
 	zend_error_noreturn(E_COMPILE_ERROR,
 		"Type of %s::$%s must be %s (as in class %s)",
 		ZSTR_VAL(child->ce->name),
-		ZSTR_VAL(child->name),
+		zend_get_unmangled_property_name(child->name),
 		ZSTR_VAL(type_str),
 		ZSTR_VAL(parent->ce->name));
 }