diff --git a/detect.py b/detect.py
index f404a2503..ac18f3c36 100644
--- a/detect.py
+++ b/detect.py
@@ -219,9 +219,10 @@ def run(
         def write_to_csv(image_name, prediction, confidence):
             """Writes prediction data for an image to a CSV file, appending if the file exists."""
             data = {"Image Name": image_name, "Prediction": prediction, "Confidence": confidence}
+            file_exists = os.path.isfile(csv_path)
             with open(csv_path, mode="a", newline="") as f:
                 writer = csv.DictWriter(f, fieldnames=data.keys())
-                if not csv_path.is_file():
+                if not file_exists:
                     writer.writeheader()
                 writer.writerow(data)