diff --git a/conf.d/xdg-data-dirs.fish b/conf.d/xdg-data-dirs.fish
index af26f31..63a5d06 100644
--- a/conf.d/xdg-data-dirs.fish
+++ b/conf.d/xdg-data-dirs.fish
@@ -1 +1,5 @@
-test -x $HOME/.local/bin/update-xdg-data-dirs.py; and set -gx XDG_DATA_DIRS ($HOME/.local/bin/update-xdg-data-dirs.py)
+set uxdd (command -v update-xdg-data-dirs.py)
+
+if test -n "$uxdd" -a -x "$uxdd"
+    set -gx XDG_DATA_DIRS (uxdd)
+end