diff --git a/toolkit/components/printing/content/print.js b/toolkit/components/printing/content/print.js
index 052db8db2c57..bfa38981cc29 100644
--- a/toolkit/components/printing/content/print.js
+++ b/toolkit/components/printing/content/print.js
@@ -875,7 +875,7 @@ var PrintEventHandler = {
     let printers;
 
     if (Cu.isInAutomation) {
-      printers = await Promise.resolve(window._mockPrinters || []);
+      printers = window._mockPrinters || [];
     } else {
       try {
         printers = await printerList.printers;
diff --git a/widget/nsPrinterListCUPS.cpp b/widget/nsPrinterListCUPS.cpp
index 960fb32c4184..b1d695752652 100644
--- a/widget/nsPrinterListCUPS.cpp
+++ b/widget/nsPrinterListCUPS.cpp
@@ -180,7 +180,7 @@ nsresult nsPrinterListCUPS::SystemDefaultPrinterName(nsAString& aName) const {
   aName.Truncate();
 
   if (!CupsShim().InitOkay()) {
-    return NS_ERROR_FAILURE;
+    return NS_OK;
   }
 
   // Passing in nullptr for the name will return the default, if any.