diff --git a/examples/ch05/snippets_ipynb/05_09.ipynb b/examples/ch05/snippets_ipynb/05_09.ipynb
index 289fe9e..87576fd 100755
--- a/examples/ch05/snippets_ipynb/05_09.ipynb
+++ b/examples/ch05/snippets_ipynb/05_09.ipynb
@@ -148,7 +148,7 @@
    "outputs": [],
    "source": [
     "if key in numbers:\n",
-    "    print(f'found {key} at index {numbers.index(search_key)}')\n",
+    "    print(f'found {key} at index {numbers.index(key)}')\n",
     "else:\n",
     "    print(f'{key} not found')"
    ]
@@ -204,4 +204,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 2
-}
+}
\ No newline at end of file
diff --git a/examples/ch05/snippets_py/05_09.py b/examples/ch05/snippets_py/05_09.py
index 7f7765e..60739bc 100755
--- a/examples/ch05/snippets_py/05_09.py
+++ b/examples/ch05/snippets_py/05_09.py
@@ -29,7 +29,7 @@
 key = 1000
 
 if key in numbers:
-    print(f'found {key} at index {numbers.index(search_key)}')
+    print(f'found {key} at index {numbers.index(key)}')
 else:
     print(f'{key} not found')