diff --git a/lessons/4-ComputerVision/08-TransferLearning/TransferLearningTF.ipynb b/lessons/4-ComputerVision/08-TransferLearning/TransferLearningTF.ipynb
index c7f0a7dd..1160b8b6 100644
--- a/lessons/4-ComputerVision/08-TransferLearning/TransferLearningTF.ipynb
+++ b/lessons/4-ComputerVision/08-TransferLearning/TransferLearningTF.ipynb
@@ -512,8 +512,9 @@
     "vgg = keras.applications.VGG16()\n",
     "_weights_path = os.path.join(os.path.expanduser(\"~\"), \".keras\", \"models\",\n",
     "                             \"vgg16_weights_tf_dim_ordering_tf_kernels.h5\")\n",
-    "if _sha256(_weights_path) != VGG16_WEIGHTS_SHA256:\n",
-    "  warnings.warn(\"VGG16 weights SHA-256 mismatch - verify file integrity before use\")\n",
+if _sha256(_weights_path) != VGG16_WEIGHTS_SHA256:
+    warnings.warn("VGG16 weights SHA-256 mismatch - verify file integrity before use")
+    raise ValueError("Aborting because VGG16 weights failed integrity check")
     "inp = keras.applications.vgg16.preprocess_input(x_sample[:1])\n",
     "\n",
     "res = vgg(inp)\n",