diff --git a/src/Controller/APIController.php b/src/Controller/APIController.php
index 0bdd2c5c..56fc9fa5 100644
--- a/src/Controller/APIController.php
+++ b/src/Controller/APIController.php
@@ -3078,7 +3078,7 @@ class APIController extends Controller implements LoggedController
             $mins = $date_sched->format('i');
             if ($mins > 10)
             {
-                $next_slot_id = sprintf('%02d_$02d', $hour + 1, $hour + 2);
+                $next_slot_id = sprintf('%02d_%02d', $hour + 1, $hour + 2);
                 error_log("NEXT SLOT - $date_string - $next_slot_id");
 				// decrement rider slot
 				if (isset($hub_rider_slots[$date_string][$next_slot_id]))