diff --git a/MAC/Deployment/data/Coordinates/calc_hba_deltas.py b/MAC/Deployment/data/Coordinates/calc_hba_deltas.py
index 9d8553ada5b32e81ef276f704b9062ed398c0a10..e07ca2a58f4f1f88afacec62d88b38e526cd100f 100755
--- a/MAC/Deployment/data/Coordinates/calc_hba_deltas.py
+++ b/MAC/Deployment/data/Coordinates/calc_hba_deltas.py
@@ -26,7 +26,8 @@ def getRotation(station, anttype):
     if record != None:
         rotation = float(record[2])
         return(rotation)
-    return(0.0)
+    print "Could not find field rotation for station",station,anttype
+    exit(1)
 
 ##
 def getRotationMatrix(station, anttype):