diff --git a/packaging/nix/default.nix b/packaging/nix/default.nix
index 6be05643..15410c67 100644
--- a/packaging/nix/default.nix
+++ b/packaging/nix/default.nix
@@ -38,7 +38,8 @@ stdenv.mkDerivation {
     substituteAll ${./wrapper} $out/bin/clang-uml
     chmod +x $out/bin/clang-uml
 
-    installShellCompletion --bash $src/packaging/autocomplete/clang-uml
-    installShellCompletion --zsh $src/packaging/autocomplete/_clang-uml
+    installShellCompletion --cmd clang-uml \
+      --bash $src/packaging/autocomplete/clang-uml \
+      --zsh $src/packaging/autocomplete/_clang-uml
   '';
 }