diff --git a/src/vulkan/wsi/wsi_common.c b/src/vulkan/wsi/wsi_common.c
index 80f6a5ebb3c..c3352debe90 100644
--- a/src/vulkan/wsi/wsi_common.c
+++ b/src/vulkan/wsi/wsi_common.c
@@ -3530,7 +3530,7 @@ wsi_device_supports_explicit_sync(struct wsi_device *device)
  * (since the device extension lacks per-surface feature flags)
  */
 bool
-wsi_instance_supports_google_display_timing(struct vk_instance *instance)
+wsi_instance_supports_google_display_timing(const struct vk_instance *instance)
 {
    return instance->enabled_extensions.KHR_display &&
           !(instance->enabled_extensions.EXT_headless_surface ||
diff --git a/src/vulkan/wsi/wsi_common.h b/src/vulkan/wsi/wsi_common.h
index cc8a2b2b3a9..719d3d6b6fb 100644
--- a/src/vulkan/wsi/wsi_common.h
+++ b/src/vulkan/wsi/wsi_common.h
@@ -336,7 +336,7 @@ VkImageUsageFlags
 wsi_caps_get_image_usage(void);
 
 bool
-wsi_instance_supports_google_display_timing(struct vk_instance *instance);
+wsi_instance_supports_google_display_timing(const struct vk_instance *instance);
 
 bool
 wsi_device_supports_explicit_sync(struct wsi_device *device);