diff --git a/vulkan/vkjson/vkjson_instance.cc b/vulkan/vkjson/vkjson_instance.cc
index eb0fcc3..5872495 100644
--- a/vulkan/vkjson/vkjson_instance.cc
+++ b/vulkan/vkjson/vkjson_instance.cc
@@ -363,6 +363,10 @@
   VkJsonDeviceGroup device_group;
   std::vector<VkPhysicalDeviceGroupProperties> group_properties;
   group_properties.resize(count);
+  for (auto& properties : group_properties) {
+    properties.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_GROUP_PROPERTIES;
+    properties.pNext = nullptr;
+  }
   result = vkEnumeratePhysicalDeviceGroups(vkinstance, &count,
                                            group_properties.data());
   if (result != VK_SUCCESS) {