diff --git a/settings/quickshell.nix b/settings/quickshell.nix
index ed9fb7c..e655f3c 100644
--- a/settings/quickshell.nix
+++ b/settings/quickshell.nix
@@ -1318,10 +1318,13 @@ in
                 readonly property string wxFetch: "${wxFetchScript}"
                 readonly property string xdgOpen: "${pkgs.xdg-utils}/bin/xdg-open"
                 readonly property string themeApply: "${themeApply}"
-                // Prefix of the monochrome app-icon tree. AppIcon tests a
-                // resolved icon path against this to decide whether it may
+                // Directory name of the monochrome icon theme. AppIcon tests
+                // a resolved icon path against this to decide whether it may
                 // be tinted — see the component for why that is not blanket.
-                readonly property string monoIconDir: "${monoIcons}"
+                // A name, not the store path: lookups resolve through the
+                // /run/current-system/sw symlink farm, whose paths never
+                // contain the store prefix.
+                readonly property string monoIconDir: "/${baseNameOf monoIcons}/"
             }
           '';
         };