diff --git a/lib/install/Procfile.dev b/lib/install/Procfile.dev
index 0fc822f..34c1693 100644
--- a/lib/install/Procfile.dev
+++ b/lib/install/Procfile.dev
@@ -1,2 +1,2 @@
-web: unset PORT && env RUBY_DEBUG_OPEN=true bin/rails server
+web: env RUBY_DEBUG_OPEN=true bin/rails server
 css: yarn build:css --watch
diff --git a/lib/install/dev b/lib/install/dev
index 74ade16..a4e05fa 100755
--- a/lib/install/dev
+++ b/lib/install/dev
@@ -5,4 +5,7 @@ if ! gem list foreman -i --silent; then
   gem install foreman
 fi
 
+# Default to port 3000 if not specified
+export PORT="${PORT:-3000}"
+
 exec foreman start -f Procfile.dev "$@"