diff --git a/exercise_files/10_04_Challenge.ipynb b/exercise_files/10_04_Challenge.ipynb
index 6676192..6f8aeca 100644
--- a/exercise_files/10_04_Challenge.ipynb
+++ b/exercise_files/10_04_Challenge.ipynb
@@ -78,7 +78,7 @@
     "\n",
     "encodeFile('10_04_challenge_art.txt', '10_04_challenge_art_encoded.txt')\n",
     "\n",
-    "print(f'New file size: {os.path.getsize('10_04_challenge_art_encoded.txt')}')\n"
+    "print(f'New file size: {os.path.getsize(\"10_04_challenge_art_encoded.txt\")}')\n"
    ]
   },
   {