diff --git a/ucf.py b/ucf.py
index 868cbf7..58d8293 100644
--- a/ucf.py
+++ b/ucf.py
@@ -864,9 +864,9 @@ def colmap_from_flags(irank,ihybrid,idem,iscal):
       col['tyc'] = ioffset; ioffset+=1
       col['tzc'] = ioffset; ioffset+=1
     if iscal>0:
-      for ii in range(0,iscal):
-        col['s'+str(ii)] = ioffset; ioffset+=1
-        col['q'+str(ii)] = ioffset; ioffset+=1
+      for ii in range(iscal):
+        col['s'+str(ii+1)] = ioffset; ioffset+=1
+        col['q'+str(ii+1)] = ioffset; ioffset+=1
     return col
 
 def grid_chunk(chunk,gridg):