--- a/widget/windows/PDFViaEMFPrintHelper.cpp
+++ b/widget/windows/PDFViaEMFPrintHelper.cpp
@@ -82,19 +82,18 @@ PDFViaEMFPrintHelper::RenderPageToDC(HDC
 
   if (aPageWidth <= 0 || aPageHeight <= 0) {
     return false;
   }
 
   FPDF_PAGE pdfPage = mPDFiumEngine->LoadPage(mPDFDoc, aPageIndex);
   NS_ENSURE_TRUE(pdfPage, false);
 
-  int dcWidth = ::GetDeviceCaps(aDC, HORZRES);
-  int dcHeight = ::GetDeviceCaps(aDC, VERTRES);
-  float scaleFactor = ComputeScaleFactor(dcWidth,dcHeight,
+  float scaleFactor = ComputeScaleFactor(::GetDeviceCaps(aDC, HORZRES),
+                                         ::GetDeviceCaps(aDC, VERTRES),
                                          aPageWidth, aPageHeight);
   int savedState = ::SaveDC(aDC);
   ::SetGraphicsMode(aDC, GM_ADVANCED);
   XFORM xform = { 0 };
   xform.eM11 = xform.eM22 = scaleFactor;
   ::ModifyWorldTransform(aDC, &xform, MWT_LEFTMULTIPLY);
 
   // The caller wanted all drawing to happen within the bounds specified.