diff --git a/src/util/00-radv-defaults.conf b/src/util/00-radv-defaults.conf
index c224e721577..97fbfead76b 100644
--- a/src/util/00-radv-defaults.conf
+++ b/src/util/00-radv-defaults.conf
@@ -263,6 +263,11 @@ Application bugs worked around in this file:
             <!-- Force waiting for VM MAP updates at allocation time to
                  workaround an use-before-alloc which causes GPU hangs. -->
             <option name="radv_wait_for_vm_map_updates" value="true" />
+            <!-- Using 64 byte descriptors lets vkd3d-proton work around
+                 descriptor type mismatches.
+                 TODO Remove this when VK_EXT_descriptor_heap is enabled by
+                 default because it should not be necessary anymore. -->
+            <option name="radv_force_64_byte_sampled_image" value="true" />
         </application>
 
         <application name="Far Cry 2" application_name_match="FarCry2.exe">