diff --git a/pi/migrations/0004_simulation_x_y_logging.py b/pi/migrations/0004_simulation_x_y_logging.py
index 02db64a..0670024 100644
--- a/pi/migrations/0004_simulation_x_y_logging.py
+++ b/pi/migrations/0004_simulation_x_y_logging.py
@@ -13,13 +13,13 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='pilog',
             name='simulation_x',
-            field=models.DecimalField(decimal_places=10, default=0.0, max_digits=11),
+            field=models.DecimalField(decimal_places=10, default=-1.0, max_digits=11),
             preserve_default=False,
         ),
         migrations.AddField(
             model_name='pilog',
             name='simulation_y',
-            field=models.DecimalField(decimal_places=10, default=0.0, max_digits=11),
+            field=models.DecimalField(decimal_places=10, default=-1.0, max_digits=11),
             preserve_default=False,
         ),
     ]