diff --git a/processing/post/scaleData.py b/processing/post/scaleData.py
index 4484c5300..58f853251 100755
--- a/processing/post/scaleData.py
+++ b/processing/post/scaleData.py
@@ -36,7 +36,7 @@ parser.set_defaults(label  = [],
 (options,filenames) = parser.parse_args()
 if filenames == []: filenames = [None]
 
-if len(options.label) != len(options.factor):
+if len(options.labels) != len(options.factor):
     parser.error('number of column labels and factors do not match.')
 
 for name in filenames:
diff --git a/processing/post/shiftData.py b/processing/post/shiftData.py
index fb2ba48f9..57b20fbd0 100755
--- a/processing/post/shiftData.py
+++ b/processing/post/shiftData.py
@@ -36,7 +36,7 @@ parser.set_defaults(label  = [],
 (options,filenames) = parser.parse_args()
 if filenames == []: filenames = [None]
 
-if len(options.label) != len(options.offset):
+if len(options.labels) != len(options.offset):
     parser.error('number of column labels and offsets do not match.')
 
 for name in filenames: