diff --git a/themes/fisk/concat.fish b/themes/fisk/_fisk_concat.fish
similarity index 66%
rename from themes/fisk/concat.fish
rename to themes/fisk/_fisk_concat.fish
index f4e2d38..29f3354 100644
--- a/themes/fisk/concat.fish
+++ b/themes/fisk/_fisk_concat.fish
@@ -1,4 +1,4 @@
-function concat
+function _fisk_concat
   for i in $argv
     echo -n $i;
   end