diff --git a/lib/readline.js b/lib/readline.js
index e6b57927791..0161b4e292e 100644
--- a/lib/readline.js
+++ b/lib/readline.js
@@ -188,12 +188,14 @@ Interface.prototype._onLine = function(line) {
 Interface.prototype._addHistory = function() {
   if (this.line.length === 0) return '';
 
-  this.history.unshift(this.line);
+  if (this.history.length === 0 || this.history[0] !== this.line) {
+    this.history.unshift(this.line);
+
+    // Only store so many
+    if (this.history.length > kHistorySize) this.history.pop();
+  }
+
   this.historyIndex = -1;
-
-  // Only store so many
-  if (this.history.length > kHistorySize) this.history.pop();
-
   return this.history[0];
 };