diff --git a/DirectXTex/DirectXTexConvert.cpp b/DirectXTex/DirectXTexConvert.cpp
index d9c2485..4aaa624 100644
--- a/DirectXTex/DirectXTexConvert.cpp
+++ b/DirectXTex/DirectXTexConvert.cpp
@@ -4358,8 +4358,8 @@ namespace
         _Out_ WICPixelFormatGUID& pfGUID,
         _Out_ WICPixelFormatGUID& targetGUID)
     {
-        memcpy(&pfGUID, &GUID_NULL, sizeof(GUID));
-        memcpy(&targetGUID, &GUID_NULL, sizeof(GUID));
+        memset(&pfGUID, 0, sizeof(GUID));
+        memset(&targetGUID, 0, sizeof(GUID));
 
         if (filter & TEX_FILTER_FORCE_NON_WIC)
         {
diff --git a/DirectXTex/DirectXTexUtil.cpp b/DirectXTex/DirectXTexUtil.cpp
index 29fcc52..68fc22a 100644
--- a/DirectXTex/DirectXTexUtil.cpp
+++ b/DirectXTex/DirectXTexUtil.cpp
@@ -197,7 +197,7 @@ bool DirectX::_DXGIToWIC(DXGI_FORMAT format, GUID& guid, bool ignoreRGBvsBGR)
             break;
     }
 
-    memcpy(&guid, &GUID_NULL, sizeof(GUID));
+    memset(&guid, 0, sizeof(GUID));
     return false;
 }