diff --git a/Zend/zend_API.c b/Zend/zend_API.c
index 82a56f5b6abc6..781666fddb1f4 100644
--- a/Zend/zend_API.c
+++ b/Zend/zend_API.c
@@ -1610,8 +1610,11 @@ static zend_always_inline void _object_properties_init(zend_object *object, zend
 		zval *end = src + class_type->default_properties_count;
 
 		if (UNEXPECTED(class_type->type == ZEND_INTERNAL_CLASS)) {
+			/* We don't have to account for refcounting because
+			 * zend_declare_typed_property() disallows refcounted defaults for internal classes. */
 			do {
-				ZVAL_COPY_OR_DUP_PROP(dst, src);
+				ZEND_ASSERT(!Z_REFCOUNTED_P(src));
+				ZVAL_COPY_VALUE_PROP(dst, src);
 				src++;
 				dst++;
 			} while (src != end);
diff --git a/Zend/zend_inheritance.c b/Zend/zend_inheritance.c
index d1c66b310a6b4..7d605fc38c8c0 100644
--- a/Zend/zend_inheritance.c
+++ b/Zend/zend_inheritance.c
@@ -1547,7 +1547,10 @@ ZEND_API void zend_do_inheritance_ex(zend_class_entry *ce, zend_class_entry *par
 			do {
 				dst--;
 				src--;
-				ZVAL_COPY_OR_DUP_PROP(dst, src);
+				/* We don't have to account for refcounting because
+				 * zend_declare_typed_property() disallows refcounted defaults for internal classes. */
+				ZEND_ASSERT(!Z_REFCOUNTED_P(src));
+				ZVAL_COPY_VALUE_PROP(dst, src);
 				if (Z_OPT_TYPE_P(dst) == IS_CONSTANT_AST) {
 					ce->ce_flags &= ~ZEND_ACC_CONSTANTS_UPDATED;
 					ce->ce_flags |= ZEND_ACC_HAS_AST_PROPERTIES;