diff --git a/lib/_debugger.js b/lib/_debugger.js
index f155ca2e71c..859dc2c1af0 100644
--- a/lib/_debugger.js
+++ b/lib/_debugger.js
@@ -652,7 +652,7 @@ Interface.prototype.complete = function(line) {
   line = line.replace(/^\s*/, '');
 
   for (var i = 0; i < commands.length; i++) {
-    if (commands[i].indexOf(line) >= 0) {
+    if (commands[i].indexOf(line) === 0) {
       matches.push(commands[i]);
     }
   }