diff --git a/src/gui/CMakeLists.txt b/src/gui/CMakeLists.txt
index 37cefa9a259..0a97623fce7 100644
--- a/src/gui/CMakeLists.txt
+++ b/src/gui/CMakeLists.txt
@@ -827,7 +827,7 @@ qt_internal_extend_target(Gui CONDITION QT_FEATURE_filesystemmodel
 
 qt_internal_extend_target(Gui CONDITION QT_FEATURE_vulkan
     SOURCES
-        rhi/qrhivulkan.cpp rhi/qrhivulkan_p.h rhi/qrhivulkanext_p.h
+        rhi/qrhivulkan.cpp rhi/qrhivulkan_p.h
         vulkan/qbasicvulkanplatforminstance.cpp vulkan/qbasicvulkanplatforminstance_p.h
         vulkan/qplatformvulkaninstance.cpp vulkan/qplatformvulkaninstance.h
         vulkan/qvulkandefaultinstance.cpp vulkan/qvulkandefaultinstance_p.h
diff --git a/src/gui/rhi/qrhivulkan.cpp b/src/gui/rhi/qrhivulkan.cpp
index 0cf8f023d41..db9c6ed6ad6 100644
--- a/src/gui/rhi/qrhivulkan.cpp
+++ b/src/gui/rhi/qrhivulkan.cpp
@@ -2,7 +2,6 @@
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
 #include "qrhivulkan_p.h"
-#include "qrhivulkanext_p.h"
 #include <qpa/qplatformvulkaninstance.h>
 
 #define VMA_IMPLEMENTATION
@@ -603,12 +602,14 @@ bool QRhiVulkan::create(QRhi::Flags flags)
         }
 
         caps.vertexAttribDivisor = false;
+#ifdef VK_EXT_vertex_attribute_divisor
         if (devExts.contains(VK_EXT_VERTEX_ATTRIBUTE_DIVISOR_EXTENSION_NAME)) {
             if (hasPhysDevProp2) {
                 requestedDevExts.append(VK_EXT_VERTEX_ATTRIBUTE_DIVISOR_EXTENSION_NAME);
                 caps.vertexAttribDivisor = true;
             }
         }
+#endif
 
         for (const QByteArray &ext : requestedDeviceExtensions) {
             if (!ext.isEmpty() && !requestedDevExts.contains(ext)) {
@@ -7048,7 +7049,9 @@ bool QVkGraphicsPipeline::create()
     pipelineInfo.pStages = shaderStageCreateInfos.constData();
 
     QVarLengthArray<VkVertexInputBindingDescription, 4> vertexBindings;
+#ifdef VK_EXT_vertex_attribute_divisor
     QVarLengthArray<VkVertexInputBindingDivisorDescriptionEXT> nonOneStepRates;
+#endif
     int bindingIndex = 0;
     for (auto it = m_vertexInputLayout.cbeginBindings(), itEnd = m_vertexInputLayout.cendBindings();
          it != itEnd; ++it, ++bindingIndex)
@@ -7060,9 +7063,12 @@ bool QVkGraphicsPipeline::create()
                 ? VK_VERTEX_INPUT_RATE_VERTEX : VK_VERTEX_INPUT_RATE_INSTANCE
         };
         if (it->classification() == QRhiVertexInputBinding::PerInstance && it->instanceStepRate() != 1) {
+#ifdef VK_EXT_vertex_attribute_divisor
             if (rhiD->caps.vertexAttribDivisor) {
                 nonOneStepRates.append({ uint32_t(bindingIndex), it->instanceStepRate() });
-            } else {
+            } else
+#endif
+            {
                 qWarning("QRhiVulkan: Instance step rates other than 1 not supported without "
                          "VK_EXT_vertex_attribute_divisor on the device and "
                          "VK_KHR_get_physical_device_properties2 on the instance");
@@ -7088,13 +7094,15 @@ bool QVkGraphicsPipeline::create()
     vertexInputInfo.pVertexBindingDescriptions = vertexBindings.constData();
     vertexInputInfo.vertexAttributeDescriptionCount = uint32_t(vertexAttributes.size());
     vertexInputInfo.pVertexAttributeDescriptions = vertexAttributes.constData();
+#ifdef VK_EXT_vertex_attribute_divisor
     VkPipelineVertexInputDivisorStateCreateInfoEXT divisorInfo = {};
     if (!nonOneStepRates.isEmpty()) {
-        divisorInfo.sType = VkStructureType(1000190001); // VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_DIVISOR_STATE_CREATE_INFO_EXT
+        divisorInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_DIVISOR_STATE_CREATE_INFO_EXT;
         divisorInfo.vertexBindingDivisorCount = uint32_t(nonOneStepRates.size());
         divisorInfo.pVertexBindingDivisors = nonOneStepRates.constData();
         vertexInputInfo.pNext = &divisorInfo;
     }
+#endif
     pipelineInfo.pVertexInputState = &vertexInputInfo;
 
     QVarLengthArray<VkDynamicState, 8> dynEnable;
diff --git a/src/gui/rhi/qrhivulkanext_p.h b/src/gui/rhi/qrhivulkanext_p.h
deleted file mode 100644
index 02b346948bc..00000000000
--- a/src/gui/rhi/qrhivulkanext_p.h
+++ /dev/null
@@ -1,48 +0,0 @@
-// Copyright (C) 2018 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
-
-#ifndef QRHIVULKANEXT_P_H
-#define QRHIVULKANEXT_P_H
-
-//
-//  W A R N I N G
-//  -------------
-//
-// This file is not part of the Qt API.  It exists purely as an
-// implementation detail.  This header file may change from version to
-// version without notice, or even be removed.
-//
-// We mean it.
-//
-
-#include "qrhivulkan_p.h"
-
-QT_BEGIN_NAMESPACE
-
-#ifndef VK_EXT_vertex_attribute_divisor
-#define VK_EXT_vertex_attribute_divisor 1
-#define VK_EXT_VERTEX_ATTRIBUTE_DIVISOR_SPEC_VERSION 2
-#define VK_EXT_VERTEX_ATTRIBUTE_DIVISOR_EXTENSION_NAME "VK_EXT_vertex_attribute_divisor"
-
-typedef struct VkPhysicalDeviceVertexAttributeDivisorPropertiesEXT {
-    VkStructureType    sType;
-    void*              pNext;
-    uint32_t           maxVertexAttribDivisor;
-} VkPhysicalDeviceVertexAttributeDivisorPropertiesEXT;
-
-typedef struct VkVertexInputBindingDivisorDescriptionEXT {
-    uint32_t    binding;
-    uint32_t    divisor;
-} VkVertexInputBindingDivisorDescriptionEXT;
-
-typedef struct VkPipelineVertexInputDivisorStateCreateInfoEXT {
-    VkStructureType                                     sType;
-    const void*                                         pNext;
-    uint32_t                                            vertexBindingDivisorCount;
-    const VkVertexInputBindingDivisorDescriptionEXT*    pVertexBindingDivisors;
-} VkPipelineVertexInputDivisorStateCreateInfoEXT;
-#endif // VK_EXT_vertex_attribute_divisor
-
-QT_END_NAMESPACE
-
-#endif