--- a/widget/windows/nsDeviceContextSpecWin.cpp
+++ b/widget/windows/nsDeviceContextSpecWin.cpp
@@ -439,17 +439,18 @@ nsPrinterEnumeratorWin::InitPrintSetting
   devSpecWin->GetDevMode(devmode);
   if (NS_WARN_IF(!devmode)) {
     return NS_ERROR_FAILURE;
   }
 
   aPrintSettings->SetPrinterName(aPrinterName);
 
   // We need to get information from the device as well.
-  HDC dc = ::CreateICW(kDriverName, aPrinterName, nullptr, devmode);
+  char16ptr_t printerName = aPrinterName;
+  HDC dc = ::CreateICW(kDriverName, printerName, nullptr, devmode);
   if (NS_WARN_IF(!dc)) {
     return NS_ERROR_FAILURE;
   }
 
   nsCOMPtr<nsIPrintSettingsWin> psWin = do_QueryInterface(aPrintSettings);
   MOZ_ASSERT(psWin);
   psWin->CopyFromNative(dc, devmode);
   ::DeleteDC(dc);