diff --git a/src/xenia/app/emulator_window.h b/src/xenia/app/emulator_window.h
index 673ad8437..ff081175f 100644
--- a/src/xenia/app/emulator_window.h
+++ b/src/xenia/app/emulator_window.h
@@ -36,6 +36,7 @@ class EmulatorWindow {
   ui::Window* window() const { return window_.get(); }
 
   void UpdateTitle();
+  void ToggleFullscreen();
 
  private:
   explicit EmulatorWindow(Emulator* emulator);
@@ -52,7 +53,6 @@ class EmulatorWindow {
   void CpuBreakIntoDebugger();
   void GpuTraceFrame();
   void GpuClearCaches();
-  void ToggleFullscreen();
   void ShowHelpWebsite();
 
   Emulator* emulator_;
diff --git a/src/xenia/app/xenia_main.cc b/src/xenia/app/xenia_main.cc
index ed42869ab..03664f4a9 100644
--- a/src/xenia/app/xenia_main.cc
+++ b/src/xenia/app/xenia_main.cc
@@ -42,6 +42,7 @@ DEFINE_string(gpu, "any", "Graphics system. Use: [any, gl4, vulkan, null]");
 DEFINE_string(hid, "any", "Input system. Use: [any, nop, winkey, xinput]");
 
 DEFINE_string(target, "", "Specifies the target .xex or .iso to execute.");
+DEFINE_bool(fullscreen, false, "Toggles fullscreen");
 
 namespace xe {
 namespace app {
@@ -191,6 +192,9 @@ int xenia_main(const std::vector<std::wstring>& args) {
     }
   }
 
+  // Toggles fullscreen
+  if (FLAGS_fullscreen) emulator_window->ToggleFullscreen();
+
   if (!path.empty()) {
     // Normalize the path and make absolute.
     std::wstring abs_path = xe::to_absolute_path(path);