diff --git a/share/completions/isatty.fish b/share/completions/isatty.fish
new file mode 100644
index 000000000..2ee644b0f
--- /dev/null
+++ b/share/completions/isatty.fish
@@ -0,0 +1 @@
+complete -c isatty -x -k -a "stdin stdout stderr"