diff --git a/pepys_import/core/store/data_store.py b/pepys_import/core/store/data_store.py
index 7ef3dc335..d0265e3bb 100644
--- a/pepys_import/core/store/data_store.py
+++ b/pepys_import/core/store/data_store.py
@@ -1940,6 +1940,10 @@ def split_platform(self, platform_id, set_percentage=None) -> bool:
         percent_per_iteration = 100.0 / len(datafile_ids)
 
         objects = self._get_comments_and_sensors_of_platform(platform)
+
+        i = 0
+        percent_per_iteration = 100.0 / len(datafile_ids)
+
         for key, values in datafile_ids.items():
             time, measurement_objects = values["time"], values["objects"]
             new_platform = self.add_to_platforms(