diff --git a/app/streaming/session.cpp b/app/streaming/session.cpp
index 5e971365..261e4423 100644
--- a/app/streaming/session.cpp
+++ b/app/streaming/session.cpp
@@ -531,6 +531,15 @@ bool Session::initialize()
         break;
     }
 
+#ifdef Q_OS_DARWIN
+    // macOS behaves as if we're capturing system keys when
+    // we enter "real" full-screen mode, so use standard
+    // full-screen as our full-screen flag when capturing keys.
+    if (m_Preferences->captureSysKeys) {
+        m_FullScreenFlag = SDL_WINDOW_FULLSCREEN;
+    }
+#endif
+
 #if !SDL_VERSION_ATLEAST(2, 0, 11)
     // HACK: Using a full-screen window breaks mouse capture on the Pi's LXDE
     // GUI environment. Force the session to use windowed mode (which won't