diff --git a/src/swrenderer/r_swcanvas.cpp b/src/swrenderer/r_swcanvas.cpp
index 087d0ca87..88c0a6b29 100644
--- a/src/swrenderer/r_swcanvas.cpp
+++ b/src/swrenderer/r_swcanvas.cpp
@@ -271,8 +271,8 @@ void SWCanvas::FillSimplePoly(DCanvas *canvas, FTexture *tex, FVector2 *points,
 
 	viewport->RenderTarget->Lock(true);
 
-	scalex /= tex->Scale.X;
-	scaley /= tex->Scale.Y;
+	scalex = tex->Scale.X / scalex;
+	scaley = tex->Scale.Y / scaley;
 
 	// Use the CRT's functions here.
 	cosrot = cos(rotation.Radians());