diff --git a/config/puma.rb b/config/puma.rb
index 4fe6d97c7c04..2b9f7a1fcba5 100644
--- a/config/puma.rb
+++ b/config/puma.rb
@@ -7,12 +7,13 @@
 threads_max_count = OpenProject::Configuration.web_max_threads
 threads threads_min_count, [threads_min_count, threads_max_count].max
 
-# Specifies the `port` that Puma will listen on to receive requests; default is 3000.
-#
+# Specifies the address on which Puma will listen on to receive requests; default is 127.0.0.1.
+set_default_host ENV.fetch("HOST") { "127.0.0.1" }
+
+# Specifies the port that Puma will listen on to receive requests; default is 3000.
 port ENV.fetch("PORT") { 3000 }.to_i
 
-# Specifies the `environment` that Puma will run in.
-#
+# Specifies the environment that Puma will run in.
 environment ENV.fetch("RAILS_ENV") { "development" }
 
 # Specifies the number of `workers` to boot in clustered mode.