diff --git a/DirectXTex/DirectXTexResize.cpp b/DirectXTex/DirectXTexResize.cpp
index b9cd7d3..2761cab 100644
--- a/DirectXTex/DirectXTexResize.cpp
+++ b/DirectXTex/DirectXTexResize.cpp
@@ -254,7 +254,7 @@ namespace
         assert(srcImage.format == destImage.format);
 
         // Allocate temporary space (2 scanlines)
-        auto scanline = make_AlignedArrayXMVECTOR(srcImage.width + destImage.width);
+        auto scanline = make_AlignedArrayXMVECTOR(uint64_t(srcImage.width) + destImage.width);
         if (!scanline)
             return E_OUTOFMEMORY;