diff --git a/core/rend/gl4/gles.cpp b/core/rend/gl4/gles.cpp
index 202d48b31..4d3003569 100644
--- a/core/rend/gl4/gles.cpp
+++ b/core/rend/gl4/gles.cpp
@@ -656,7 +656,7 @@ static bool RenderFrame()
 	{
 		scale_x=fb_scale_x;
 		scale_y=fb_scale_y;
-		if (SCALER_CTL.interlace == 0)
+		if (SCALER_CTL.interlace == 0 && SCALER_CTL.vscalefactor >= 0x400)
 			scale_y *= SCALER_CTL.vscalefactor / 0x400;
 
 		//work out scaling parameters !
@@ -870,7 +870,7 @@ static bool RenderFrame()
 			float min_y = pvrrc.fb_Y_CLIP.min / scale_y;
 			if (!is_rtt)
 			{
-				if (SCALER_CTL.interlace)
+				if (SCALER_CTL.interlace && SCALER_CTL.vscalefactor >= 0x400)
 				{
 					// Clipping is done after scaling/filtering so account for that if enabled
 					height *= SCALER_CTL.vscalefactor / 0x400;
diff --git a/core/rend/gles/gles.cpp b/core/rend/gles/gles.cpp
index 684f96e26..9e7c812a2 100644
--- a/core/rend/gles/gles.cpp
+++ b/core/rend/gles/gles.cpp
@@ -1651,7 +1651,7 @@ bool RenderFrame()
 	{
 		scale_x=fb_scale_x;
 		scale_y=fb_scale_y;
-		if (SCALER_CTL.interlace == 0)
+		if (SCALER_CTL.interlace == 0 && SCALER_CTL.vscalefactor >= 0x400)
 			scale_y *= SCALER_CTL.vscalefactor / 0x400;
 
 		//work out scaling parameters !
@@ -1902,7 +1902,7 @@ bool RenderFrame()
 			float min_y = pvrrc.fb_Y_CLIP.min / scale_y;
 			if (!is_rtt)
 			{
-				if (SCALER_CTL.interlace)
+				if (SCALER_CTL.interlace && SCALER_CTL.vscalefactor >= 0x400)
 				{
 					// Clipping is done after scaling/filtering so account for that if enabled
 					height *= SCALER_CTL.vscalefactor / 0x400;