diff --git a/backend/src/langs.ts b/backend/src/langs.ts
index 02bd5ed..f61c6dd 100644
--- a/backend/src/langs.ts
+++ b/backend/src/langs.ts
@@ -1241,6 +1241,7 @@ end.
     repl: "re.pl",
     main: "main.pl",
     run: "re.pl --rcfile ./main.pl",
+    format: "cat main.pl | perltidy",
     template: `print("Hello, world!\\n")
 `,
   },
diff --git a/scripts/docker-install-phase4.bash b/scripts/docker-install-phase4.bash
index 5c1197e..aa827ec 100755
--- a/scripts/docker-install-phase4.bash
+++ b/scripts/docker-install-phase4.bash
@@ -85,6 +85,7 @@ ln -s /opt/opam/default/bin/ocamllsp /usr/local/bin/ocamllsp
 
 # Perl
 cpanm -n Devel::REPL
+cpanm -n Perl::Tidy
 
 # PHP
 npm install -g intelephense