diff --git a/src/cascadia/TerminalControl/TermControl.cpp b/src/cascadia/TerminalControl/TermControl.cpp
index e36fadd6a..3e3d7414e 100644
--- a/src/cascadia/TerminalControl/TermControl.cpp
+++ b/src/cascadia/TerminalControl/TermControl.cpp
@@ -900,6 +900,24 @@ namespace winrt::Microsoft::Terminal::Control::implementation
             return;
         }
 
+        if (vkey == VK_SPACE && modifiers.IsAltPressed())
+        {
+            if (const auto bindings = _settings.KeyBindings())
+            {
+                if (!bindings.IsKeyChordExplicitlyUnbound({ modifiers.IsCtrlPressed(), modifiers.IsAltPressed(), modifiers.IsShiftPressed(), modifiers.IsWinPressed(), vkey, scanCode }))
+                {
+                    // If we get here, it means that
+                    //      1. we do not have a command bound to alt+space
+                    //      2. alt+space was not explicitly unbound
+                    // That means that XAML handled the alt+space to open up the context menu, and
+                    // so we don't want to send anything to the terminal
+                    // TODO GH#11018: Add a new "openSystemMenu" keybinding
+                    e.Handled(true);
+                    return;
+                }
+            }
+        }
+
         if (_TrySendKeyEvent(vkey, scanCode, modifiers, keyDown))
         {
             e.Handled(true);