diff --git a/binder/README.ipynb b/binder/README.ipynb
index 66630c9e..960f368f 100644
--- a/binder/README.ipynb
+++ b/binder/README.ipynb
@@ -20,7 +20,7 @@
     "import os\n",
     "\n",
     "print(\n",
-    "    f'This container is using tag {os.environ[\"TAG\"]} of the jupyter/base-notebook image'\n",
+    "    f\"This container is using tag {os.environ['TAG']} of the jupyter/base-notebook image\"\n",
     ")"
    ]
   },