diff --git a/pkgs/development/tools/misc/luarocks/default.nix b/pkgs/development/tools/misc/luarocks/default.nix
index c8d36a1e3313..a446fb0b41f3 100644
--- a/pkgs/development/tools/misc/luarocks/default.nix
+++ b/pkgs/development/tools/misc/luarocks/default.nix
@@ -67,7 +67,19 @@ stdenv.mkDerivation (finalAttrs: {
     sed -e "1s@.*@#! ${lua}/bin/lua$LUA_SUFFIX@" -i "$out"/bin/*
     substituteInPlace $out/etc/luarocks/* \
      --replace '${lua.luaOnBuild}' '${lua}'
+   ''
+    + lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
+    installShellCompletion --cmd luarocks \
+      --bash <($out/bin/luarocks completion bash) \
+      --fish <($out/bin/luarocks completion fish) \
+      --zsh <($out/bin/luarocks completion zsh)
 
+    installShellCompletion --cmd luarocks-admin \
+      --bash <($out/bin/luarocks-admin completion bash) \
+      --fish <($out/bin/luarocks-admin completion fish) \
+      --zsh <($out/bin/luarocks-admin completion zsh)
+  ''
+  + ''
     for i in "$out"/bin/*; do
         test -L "$i" || {
             wrapProgram "$i" \
@@ -79,11 +91,6 @@ stdenv.mkDerivation (finalAttrs: {
                 lib.optionals (finalAttrs.pname == "luarocks-nix") [ file nix-prefetch-git ])}
         }
     done
-  '' + lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
-    installShellCompletion --cmd luarocks \
-      --bash <($out/bin/luarocks completion bash) \
-      --fish <($out/bin/luarocks completion fish) \
-      --zsh <($out/bin/luarocks completion zsh)
   '';
 
   propagatedBuildInputs = [ zip unzip cmake ];