diff --git a/lib/renderers/cli.js b/lib/renderers/cli.js
index 609a350b..43762ab7 100644
--- a/lib/renderers/cli.js
+++ b/lib/renderers/cli.js
@@ -68,7 +68,13 @@ var colorful = {
     data: function (data) {
         data.data = data.data || '';
 
-        this._write(process.stdout, 'bower ' + renderTagPlusLabel(data) + ' ' + data.data + '\n');
+        var outputStream = process.stdout;
+
+        if (data.level === 'warn') {
+            outputStream = process.stderr;
+        }
+
+        this._write(outputStream, 'bower ' + renderTagPlusLabel(data) + ' ' + data.data + '\n');
     },
     checkout: function (data) {
         if (isCompact()) {