diff --git a/samples/colab/test_notebooks.py b/samples/colab/test_notebooks.py
index 8a17e32e584b2..646fc99c0a4e5 100755
--- a/samples/colab/test_notebooks.py
+++ b/samples/colab/test_notebooks.py
@@ -22,7 +22,9 @@
 ]
 
 NOTEBOOKS_EXPECTED_TO_FAIL = [
-    # None!
+    # See https://github.com/iree-org/iree/issues/18919
+    "tensorflow_hub_import.ipynb",
+    "tflite_text_classification.ipynb",
 ]