diff --git a/share/functions/fish_fletcher16.fish b/share/functions/fish_fletcher16.fish
deleted file mode 100644
index beaf8cb20..000000000
--- a/share/functions/fish_fletcher16.fish
+++ /dev/null
@@ -1,10 +0,0 @@
-function fish_fletcher16 --argument input -d "compute a fletcher 16 checksum"
-    set -l sum1 0
-    set -l sum2 0
-    for char in (string split '' $input)
-        set -l ordinal (printf %2u "'$char")
-        math "($sum1 + $ordinal)" % 255 | read sum1
-        math "($sum2 + $sum1)" % 255 | read sum2
-    end
-    math "bitor $sum1,$(math $sum2 '*' pow 2,8)"
-end