diff --git a/src/gui/vulkan/qvulkaninstance.cpp b/src/gui/vulkan/qvulkaninstance.cpp
index 538a59c28f5..fc4a916cb43 100644
--- a/src/gui/vulkan/qvulkaninstance.cpp
+++ b/src/gui/vulkan/qvulkaninstance.cpp
@@ -428,20 +428,30 @@ QVulkanInstance::~QVulkanInstance()
  */
 
 /*!
+    \fn QVulkanInfoVector<QVulkanLayer> QVulkanInstance::supportedLayers() const
     \return the list of supported instance-level layers.
 
     \note This function can be called before create().
  */
+
+/*!
+    \internal
+ */
 QVulkanInfoVector<QVulkanLayer> QVulkanInstance::supportedLayers()
 {
     return d_ptr->ensureVulkan() ? d_ptr->platformInst->supportedLayers() : QVulkanInfoVector<QVulkanLayer>();
 }
 
 /*!
+    \fn QVulkanInfoVector<QVulkanExtension> QVulkanInstance::supportedExtensions() const
     \return the list of supported instance-level extensions.
 
     \note This function can be called before create().
  */
+
+/*!
+    \internal
+ */
 QVulkanInfoVector<QVulkanExtension> QVulkanInstance::supportedExtensions()
 {
     return d_ptr->ensureVulkan() ? d_ptr->platformInst->supportedExtensions() : QVulkanInfoVector<QVulkanExtension>();
@@ -464,7 +474,7 @@ QVulkanInfoVector<QVulkanExtension> QVulkanInstance::supportedExtensions()
 
     \sa setApiVersion()
  */
-QVersionNumber QVulkanInstance::supportedApiVersion()
+QVersionNumber QVulkanInstance::supportedApiVersion() const
 {
     return d_ptr->ensureVulkan() ? d_ptr->platformInst->supportedApiVersion() : QVersionNumber();
 }
diff --git a/src/gui/vulkan/qvulkaninstance.h b/src/gui/vulkan/qvulkaninstance.h
index 3e597f9c870..bfdaf1ab691 100644
--- a/src/gui/vulkan/qvulkaninstance.h
+++ b/src/gui/vulkan/qvulkaninstance.h
@@ -174,9 +174,14 @@ public:
     };
     Q_DECLARE_FLAGS(Flags, Flag)
 
+    // ### Qt 7: remove non-const overloads
     QVulkanInfoVector<QVulkanLayer> supportedLayers();
+    inline QVulkanInfoVector<QVulkanLayer> supportedLayers() const
+    { return const_cast<QVulkanInstance*>(this)->supportedLayers(); }
     QVulkanInfoVector<QVulkanExtension> supportedExtensions();
-    QVersionNumber supportedApiVersion();
+    inline QVulkanInfoVector<QVulkanExtension> supportedExtensions() const
+    { return const_cast<QVulkanInstance*>(this)->supportedExtensions(); }
+    QVersionNumber supportedApiVersion() const;
 
     void setVkInstance(VkInstance existingVkInstance);