diff --git a/bin/rails b/bin/rails
index 0e6a19807ed..6ce45ce44f8 100755
--- a/bin/rails
+++ b/bin/rails
@@ -1,7 +1,7 @@
 #!/usr/bin/env ruby
 
 if !ENV["RAILS_ENV"] && (ARGV == ["s"] || ARGV == ["server"])
-  ENV["UNICORN_PORT"] = 3000
+  ENV["UNICORN_PORT"] = "3000"
   exec File.expand_path("unicorn", __dir__)
 end