diff --git a/modules/ghostty/default.nix b/modules/ghostty/default.nix
index 83d45af..e45bc59 100644
--- a/modules/ghostty/default.nix
+++ b/modules/ghostty/default.nix
@@ -65,6 +65,7 @@
       window-padding-y = padding;
 
       confirm-close-surface = false;
+      gtk-single-instance   = true;
 
       window-decoration = false;