diff --git a/src/d3d9/d3d9_device.cpp b/src/d3d9/d3d9_device.cpp
index 90f130f6..7db26d82 100644
--- a/src/d3d9/d3d9_device.cpp
+++ b/src/d3d9/d3d9_device.cpp
@@ -876,11 +876,7 @@ namespace dxvk {
 
     // We may only fast path copy non identicals one way!
     // We don't know what garbage could be in the X8 data.
-    bool similar = (srcFormat == dstFormat)
-                || (srcFormat == D3D9Format::A8B8G8R8 && dstFormat == D3D9Format::X8B8G8R8)
-                || (srcFormat == D3D9Format::A8R8G8B8 && dstFormat == D3D9Format::X8R8G8B8)
-                || (srcFormat == D3D9Format::A1R5G5B5 && dstFormat == D3D9Format::X1R5G5B5)
-                || (srcFormat == D3D9Format::A4R4G4B4 && dstFormat == D3D9Format::X4R4G4B4);
+    bool similar = AreFormatsSimilar(srcFormat, dstFormat);
 
     // Copies are only supported on similar formats.
     fastPath &= similar;
diff --git a/src/d3d9/d3d9_util.h b/src/d3d9/d3d9_util.h
index 50be2daf..0edd220a 100644
--- a/src/d3d9/d3d9_util.h
+++ b/src/d3d9/d3d9_util.h
@@ -239,4 +239,12 @@ namespace dxvk {
     return D3DRENDERSTATETYPE(i ? D3DRS_COLORWRITEENABLE1 + i - 1 : D3DRS_COLORWRITEENABLE);
   }
 
+  inline bool AreFormatsSimilar(D3D9Format srcFormat, D3D9Format dstFormat) {
+    return (srcFormat == dstFormat)
+        || (srcFormat == D3D9Format::A8B8G8R8 && dstFormat == D3D9Format::X8B8G8R8)
+        || (srcFormat == D3D9Format::A8R8G8B8 && dstFormat == D3D9Format::X8R8G8B8)
+        || (srcFormat == D3D9Format::A1R5G5B5 && dstFormat == D3D9Format::X1R5G5B5)
+        || (srcFormat == D3D9Format::A4R4G4B4 && dstFormat == D3D9Format::X4R4G4B4);
+  }
+
 }
\ No newline at end of file