diff --git a/src/network/fixed.js b/src/network/fixed.js
index 78b3a1d4e..37646a481 100644
--- a/src/network/fixed.js
+++ b/src/network/fixed.js
@@ -14,7 +14,9 @@ const assert = require('assert'),
 async function getIPv4(config) {
     assert.strictEqual(typeof config, 'object');
 
-    return config.ip;
+    if ('ip' in config) return config.ip;
+
+    throw new BoxError(BoxError.NETWORK_ERROR, 'No IPv4 configured');
 }
 
 async function getIPv6(config) {