diff --git a/src/BizHawk.Client.EmuHawk/tools/GBA/GBAGPUView.cs b/src/BizHawk.Client.EmuHawk/tools/GBA/GBAGPUView.cs
index a6c3e91f65..de9619b140 100644
--- a/src/BizHawk.Client.EmuHawk/tools/GBA/GBAGPUView.cs
+++ b/src/BizHawk.Client.EmuHawk/tools/GBA/GBAGPUView.cs
@@ -7,7 +7,6 @@ using BizHawk.Client.Common;
 using BizHawk.Common.NumberExtensions;
 using BizHawk.Emulation.Cores.Nintendo.Gameboy;
 using BizHawk.Emulation.Cores.Nintendo.GBA;
-using BizHawk.Common;
 using BizHawk.Emulation.Common;
 
 namespace BizHawk.Client.EmuHawk
@@ -415,7 +414,8 @@ namespace BizHawk.Client.EmuHawk
 			Bitmap bmp = mbv.BmpView.Bmp;
 			var lockData = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
 
-			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; }
 
 			int* pixels = (int*)lockData.Scan0;
 			int pitch = lockData.Stride / sizeof(int);
@@ -507,7 +507,9 @@ namespace BizHawk.Client.EmuHawk
 
 			if (tophalfonly)
 			{
-				Win32Imports.MemSet(lockData.Scan0, 0xff, (uint)(128 * lockData.Stride));
+				byte* clear_out = (byte*)lockData.Scan0;
+				for (uint i = 0; i < (uint)(128 * lockData.Stride); i++) { clear_out[i] = 0xFF; }
+
 				pixels += 128 * pitch;
 				tiles += 16384;
 			}