diff --git a/evaluator/airborne_detection.py b/evaluator/airborne_detection.py
index 77628f6fbcba9b039892c718e6f559e6b077a5f4..9db59657c6e087f15faf3a71a682c82c9d4b3e4e 100644
--- a/evaluator/airborne_detection.py
+++ b/evaluator/airborne_detection.py
@@ -85,7 +85,7 @@ class AirbornePredictor:
     def get_all_frame_images(self, flight_id):
         frames = []
         flight_folder = join(self.test_data_path, flight_id)
-        for frame in listdir(flight_folder):
+        for frame in sorted(listdir(flight_folder)):
             if isfile(join(flight_folder, frame)):
                 frames.append(frame)
         return frames