diff --git a/src/BizHawk.Client.EmuHawk/config/GB/BmpView.cs b/src/BizHawk.Client.EmuHawk/config/GB/BmpView.cs
index c73bcfbc0e..af3d7e2b36 100644
--- a/src/BizHawk.Client.EmuHawk/config/GB/BmpView.cs
+++ b/src/BizHawk.Client.EmuHawk/config/GB/BmpView.cs
@@ -6,8 +6,6 @@ using System.Drawing.Imaging;
 using System.Drawing;
 using System.Windows.Forms;
 
-using BizHawk.Common;
-
 namespace BizHawk.Client.EmuHawk
 {
 	public class BmpView : Control
@@ -89,10 +87,11 @@ namespace BizHawk.Client.EmuHawk
 			Refresh();
 		}
 
-		public void Clear()
+		public unsafe void Clear()
 		{
 			var lockBits = Bmp.LockBits(new Rectangle(0, 0, Bmp.Width, Bmp.Height), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
-			Win32Imports.MemSet(lockBits.Scan0, 0xff, (uint)(lockBits.Height * lockBits.Stride));
+			byte* clear_out = (byte*)lockBits.Scan0;
+			for (uint i = 0; i < (uint)(lockBits.Height * lockBits.Stride); i++) { clear_out[i] = 0xFF; }
 			Bmp.UnlockBits(lockBits);
 			Refresh();
 		}
diff --git a/src/BizHawk.Client.EmuHawk/tools/GB/GBGPUView.cs b/src/BizHawk.Client.EmuHawk/tools/GB/GBGPUView.cs
index 6439095ee1..331e0bd218 100644
--- a/src/BizHawk.Client.EmuHawk/tools/GB/GBGPUView.cs
+++ b/src/BizHawk.Client.EmuHawk/tools/GB/GBGPUView.cs
@@ -8,7 +8,6 @@ using BizHawk.Client.Common;
 using BizHawk.Common.NumberExtensions;
 using BizHawk.Emulation.Common;
 using BizHawk.Emulation.Cores.Consoles.Nintendo.Gameboy;
-using BizHawk.Common;
 
 namespace BizHawk.Client.EmuHawk
 {
@@ -357,7 +356,8 @@ namespace BizHawk.Client.EmuHawk
 			byte* oam = (byte*)_oam;
 
 			// clear out the old sprite data
-			Win32Imports.MemSet(lockData.Scan0, 0xff, (uint)(lockData.Height * lockData.Stride));
+			byte* clear_out = (byte*)lockData.Scan0;
+			for (uint i = 0; i < (uint)(lockData.Height * lockData.Stride); i++) { clear_out[i] = 0xFF; }
 
 			for (int s = 0; s < 40; s++)
 			{