diff --git a/examples/02-fine-tuning.ipynb b/examples/02-fine-tuning.ipynb
index 90803c989fb..422259de424 100644
--- a/examples/02-fine-tuning.ipynb
+++ b/examples/02-fine-tuning.ipynb
@@ -146,7 +146,7 @@
    "outputs": [],
    "source": [
     "import os\n",
-    "weights = caffe_root + 'models/bvlc_reference_caffenet/bvlc_reference_caffenet.caffemodel'\n",
+    "weights = os.path.join(caffe_root, 'models/bvlc_reference_caffenet/bvlc_reference_caffenet.caffemodel')\n",
     "assert os.path.exists(weights)"
    ]
   },