diff --git a/test/common.js b/test/common.js
index 6fb357ba2586a2..48f8ea719c5c63 100644
--- a/test/common.js
+++ b/test/common.js
@@ -245,6 +245,9 @@ exports.platformTimeout = function(ms) {
   if (process.config.target_defaults.default_configuration === 'Debug')
     ms = 2 * ms;
 
+  if (exports.isAix)
+    return 2 * ms; // default localhost speed is slower on AIX
+
   if (process.arch !== 'arm')
     return ms;