diff --git a/toolkit/xre/nsAppRunner.cpp b/toolkit/xre/nsAppRunner.cpp
index da8289200e72..452195b146f3 100644
--- a/toolkit/xre/nsAppRunner.cpp
+++ b/toolkit/xre/nsAppRunner.cpp
@@ -3785,11 +3785,7 @@ int XREMain::XRE_mainStartup(bool* aExitFlag) {
   // consistently.
 
   // Set program name to the one defined in application.ini.
-  {
-    nsAutoCString program(gAppData->name);
-    ToLowerCase(program);
-    g_set_prgname(program.get());
-  }
+  g_set_prgname(gAppData->remotingName);
 
   // Initialize GTK here for splash.
 
diff --git a/widget/gtk/nsAppShell.cpp b/widget/gtk/nsAppShell.cpp
index 163a93e2d1a4..4b6d45217671 100644
--- a/widget/gtk/nsAppShell.cpp
+++ b/widget/gtk/nsAppShell.cpp
@@ -24,6 +24,7 @@
 #  include "WakeLockListener.h"
 #endif
 #include "gfxPlatform.h"
+#include "nsAppRunner.h"
 #include "ScreenHelperGTK.h"
 #include "HeadlessScreenHelper.h"
 #include "mozilla/widget/ScreenManager.h"
@@ -175,13 +176,9 @@ nsresult nsAppShell::Init() {
       // See https://bugzilla.gnome.org/show_bug.cgi?id=747634
       //
       // Only bother doing this for the parent process, since it's the one
-      // creating top-level windows. (At this point, a child process hasn't
-      // received the list of registered chrome packages, so the
-      // GetBrandShortName call would fail anyway.)
-      nsAutoString brandName;
-      mozilla::widget::WidgetUtils::GetBrandShortName(brandName);
-      if (!brandName.IsEmpty()) {
-        gdk_set_program_class(NS_ConvertUTF16toUTF8(brandName).get());
+      // creating top-level windows.
+      if (gAppData) {
+        gdk_set_program_class(gAppData->remotingName);
       }
     }
   }