diff --git a/modules/cli/tools/tmux.nix b/modules/cli/tools/tmux.nix
index afb9cb9..be0b2f3 100644
--- a/modules/cli/tools/tmux.nix
+++ b/modules/cli/tools/tmux.nix
@@ -57,8 +57,8 @@
         # suspend inner tmux (to allow nested sessions)
         bind @ { set prefix None; set key-table off }
         # NOTE: C-@ doesn't work since v3.5a (since tmux doesn't support kitty keyboard protocol)
-        # Instead, C-@ and C-Space does the same thing.
-        bind -T off C-Space { set -u prefix; set -u key-table }
+        # Instead, we bind f11 and use kitty to remap C-@ to f11.
+        bind -T off f11 { set -u prefix; set -u key-table }
       '';
   };
 }
diff --git a/modules/gui/kitty.nix b/modules/gui/kitty.nix
index ca7942a..8666224 100644
--- a/modules/gui/kitty.nix
+++ b/modules/gui/kitty.nix
@@ -28,6 +28,9 @@
       map ctrl+minus change_font_size current -1.0
       map ctrl+0 change_font_size current 0
       map ctrl+backspace change_font_size current 0
+
+      # this is used to map 
+      map ctrl+@ send_key f11
     '';
   };