diff --git a/settings/desktop.nix b/settings/desktop.nix
index c1afd0f..f7aa952 100644
--- a/settings/desktop.nix
+++ b/settings/desktop.nix
@@ -89,6 +89,12 @@
       # `messagedialog.csd.background button { color: rgba(0,0,6,0.8); }`, which
       # is why nemo's delete confirmation had near-black buttons on dark bg.
       gtk.gtk3.extraConfig.gtk-application-prefer-dark-theme = true;
+
+      # GTK's default double-click window is 400ms — wide enough that two
+      # deliberate single clicks merge into a double (nemo opening files you
+      # only meant to select). 250ms is the usual sweet spot.
+      gtk.gtk3.extraConfig.gtk-double-click-time = 250;
+      gtk.gtk4.extraConfig.gtk-double-click-time = 250;
     };
   };
 }