diff --git a/src/common/2d/v_draw.cpp b/src/common/2d/v_draw.cpp
index ef34bbb57d..cdf4413f8e 100644
--- a/src/common/2d/v_draw.cpp
+++ b/src/common/2d/v_draw.cpp
@@ -350,9 +350,9 @@ void CalcFullscreenScale(DrawParms *parms, double srcwidth, double srcheight, in
 	}
 
 	double aspect;
-	if (srcheight == 200) aspect = srcwidth / 240.;
-	else if (srcheight == 400) aspect = srcwidth / 480;
-	else aspect = srcwidth / srcheight;
+	if (srcheight == 200) srcheight = 240.;
+	else if (srcheight == 400) srcheight = 480;
+	aspect = srcwidth / srcheight;
 	rect.left = rect.top = 0;
 	auto screenratio = ActiveRatio(GetWidth(), GetHeight());
 	if (autoaspect == FSMode_ScaleToFit43 || autoaspect == FSMode_ScaleToFit43Top || autoaspect == FSMode_ScaleToFit43Bottom)
@@ -366,7 +366,7 @@ void CalcFullscreenScale(DrawParms *parms, double srcwidth, double srcheight, in
 			double width4_3 = srcheight * (4. / 3.);
 			rect.width = (double)GetWidth() * srcwidth / width4_3;
 			rect.height = GetHeight() * screenratio * (3. / 4.);	// use 4:3 for the image
-			rect.left = -(srcwidth - width4_3) / 2;
+			rect.left = (double)GetWidth() * (-(srcwidth - width4_3) / 2) / width4_3;
 			switch (oautoaspect)
 			{
 			default: