--- a/layout/printing/nsPrintEngine.cpp
+++ b/layout/printing/nsPrintEngine.cpp
@@ -1842,19 +1842,17 @@ nsPrintEngine::SetupToPrintContent()
   }
 
   nsAutoString fileNameStr;
   // check to see if we are printing to a file
   bool isPrintToFile = false;
   printData->mPrintSettings->GetPrintToFile(&isPrintToFile);
   if (isPrintToFile) {
     // On some platforms The BeginDocument needs to know the name of the file.
-    char16_t* fileName = nullptr;
-    printData->mPrintSettings->GetToFileName(&fileName);
-    fileNameStr = fileName;
+    printData->mPrintSettings->GetToFileName(getter_Copies(fileNameStr));
   }
 
   nsAutoString docTitleStr;
   nsAutoString docURLStr;
   GetDisplayTitleAndURL(printData->mPrintObject, docTitleStr, docURLStr,
                         eDocTitleDefURLDoc);
 
   int32_t startPage = 1;