diff --git a/pypeit/specobjs.py b/pypeit/specobjs.py
index 1cbbb11f92..56f4a47348 100644
--- a/pypeit/specobjs.py
+++ b/pypeit/specobjs.py
@@ -378,7 +378,7 @@ def slitorder_indices(self, slitorder):
             int:
         """
         if self[0].PYPELINE == 'Echelle':
-            indx = self.ECH_ORDERINDX == slitorder
+            indx = self.ECH_ORDER == slitorder
         elif self[0].PYPELINE == 'MultiSlit':
             indx = self.SLITID == slitorder
         elif self[0].PYPELINE == 'IFU':