diff --git a/src/d3d9/d3d9_monitor.cpp b/src/d3d9/d3d9_monitor.cpp
index 8a5656cdd..51167afd2 100644
--- a/src/d3d9/d3d9_monitor.cpp
+++ b/src/d3d9/d3d9_monitor.cpp
@@ -57,7 +57,8 @@ namespace dxvk {
         || BackBufferFormat == D3D9Format::X8R8G8B8
         || BackBufferFormat == D3D9Format::A1R5G5B5
         || BackBufferFormat == D3D9Format::X1R5G5B5
-        || BackBufferFormat == D3D9Format::R5G6B5;
+        || BackBufferFormat == D3D9Format::R5G6B5
+        || BackBufferFormat == D3D9Format::Unknown;
   }
 
 }