diff --git a/pkgs/tools/backup/restic/default.nix b/pkgs/tools/backup/restic/default.nix
index b60ea95302b6..28379107ada7 100644
--- a/pkgs/tools/backup/restic/default.nix
+++ b/pkgs/tools/backup/restic/default.nix
@@ -34,9 +34,10 @@ buildGoModule rec {
   '' + lib.optionalString (stdenv.hostPlatform == stdenv.buildPlatform) ''
     $out/bin/restic generate \
       --bash-completion restic.bash \
+      --fish-completion restic.fish \
       --zsh-completion restic.zsh \
       --man .
-    installShellCompletion restic.{bash,zsh}
+    installShellCompletion restic.{bash,fish,zsh}
     installManPage *.1
   '';