diff --git a/nixos/modules/config/gtk/gtk-icon-cache.nix b/nixos/modules/config/gtk/gtk-icon-cache.nix
index 86a6bfb5af4..7441f4de40e 100644
--- a/nixos/modules/config/gtk/gtk-icon-cache.nix
+++ b/nixos/modules/config/gtk/gtk-icon-cache.nix
@@ -77,7 +77,7 @@ with lib;
 
         if [ -w "$themedir" ]; then
           rm -f "$themedir"/icon-theme.cache
-          ${pkgs.gtk3.out}/bin/gtk-update-icon-cache --ignore-theme-index "$themedir"
+          ${pkgs.buildPackages.gtk3.out}/bin/gtk-update-icon-cache --ignore-theme-index "$themedir"
         fi
       done
     '';