diff --git a/picamera_tests.py b/picamera_tests.py
index a1bd38d0..892491eb 100755
--- a/picamera_tests.py
+++ b/picamera_tests.py
@@ -21,6 +21,7 @@ HASHED_FILES = [
     os.path.join(CAM_DIR, "__init__.py"),
     os.path.join(CAM_DIR, "picamera.py"),
     os.path.join(CAM_DIR, "picamera_recalibrate_utils.py"),
+    os.path.join(CAM_DIR, "picamera_tuning_file_utils.py"),
 ]