diff --git a/code/index.js b/code/index.js
index e413dce..400b6e0 100755
--- a/code/index.js
+++ b/code/index.js
@@ -47,6 +47,7 @@ if (process.env['NETRADIUS_SESSION_DURATION']) config.session_duration = process
 if (!config.ports.radius_authentication) config.ports.radius_authentication = 1812;
 if (!config.ports.radius_accounting) config.ports.radius_accounting = 1813;
 if (!config.ports.api) config.ports.api = 8088;
+if (!config.session_duration) config.session_duration = 1800;
 
 // Display active configuration
 log.write ('Using configuration: ' + JSON.stringify (config));