diff --git a/tools/inspector.js b/tools/inspector.js
index f9f625ab80..b4265c8b72 100644
--- a/tools/inspector.js
+++ b/tools/inspector.js
@@ -145,7 +145,7 @@ DEp.connectToChildProcess = function connectToChildProcess(child) {
   // port (not debugPort!), and create a connection to that port so that
   // the child process can communicate with node-inspector.
   child.stderr.on("data", function onData(buffer) {
-    var match = /debugger listening on port (\d+)/
+    var match = /debugger listening on port (\d+)/i
       .exec(buffer.toString("utf8"));
     if (match) {
       child.stderr.removeListener("data", onData);