diff --git a/SAS/TMSS/client/lib/mains.py b/SAS/TMSS/client/lib/mains.py
index 02b236a425f30fe98702fd727d18be12dc62e1f9..141e3c5fcd7218a735d4fcf60dfcc7b0dea863be 100644
--- a/SAS/TMSS/client/lib/mains.py
+++ b/SAS/TMSS/client/lib/mains.py
@@ -219,7 +219,7 @@ def main_trigger_scheduling_unit(scheduling_unit_observing_strategy_template_id:
 
             constraints = {"sky": {
                            "min_distance": {
-                               "sun": 0.0
+                               "sun": 0.0,
                                "moon": 0.0,
                                "jupiter": 0.0
                            },