--- a/devtools/client/webconsole/webconsole.js
+++ b/devtools/client/webconsole/webconsole.js
@@ -2085,16 +2085,19 @@ WebConsoleFrame.prototype = {
     if (this._outputQueue.length === 0 && this._flushCallback) {
       if (this._flushCallback() === false) {
         this._flushCallback = null;
       }
     }
 
     this._initOutputTimer();
 
+    // Resize the output area in case a vertical scrollbar has been added
+    this.resize();
+
     this._lastOutputFlush = Date.now();
   },
 
   /**
    * Initialize the output timer.
    * @private
    */
   _initOutputTimer: function() {