diff --git a/python/shipDigiReco.py b/python/shipDigiReco.py
index 4ac7e4f7f..15784d8d4 100644
--- a/python/shipDigiReco.py
+++ b/python/shipDigiReco.py
@@ -815,7 +815,7 @@ def smearHits(self,no_amb=None):
 
  def findTracks(self):
   hitPosLists    = {}
-  hit_detector_ids = []
+  hit_detector_ids = {}
   stationCrossed = {}
   fittedtrackids=[]
   listOfIndices  = {}