diff --git a/python/plugins/processing/algs/qgis/scripts/Frequency_analysis.py b/python/plugins/processing/algs/qgis/scripts/Frequency_analysis.py
index 9dac1f4..c9d9f9e 100644
--- a/python/plugins/processing/algs/qgis/scripts/Frequency_analysis.py
+++ b/python/plugins/processing/algs/qgis/scripts/Frequency_analysis.py
@@ -1,22 +1,22 @@
 ##Table=group
 ##Input=vector
-##Fields=string
+##Fields=Field Input
 ##Frequency=output table
 
 from processing.tools.vector import TableWriter
 from collections import defaultdict
 from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
 
-layer = processing.getObject(input)
+layer = processing.getObject(Input)
 inputFields = layer.pendingFields()
 fieldIdxs = []
-fields = fields.split(',')
+fields = Fields.split(',')
 for f in fields:
     idx = inputFields.indexFromName(f)
     if idx == -1:
         raise GeoAlgorithmExecutionException('Field not found:' + f)
     fieldIdxs.append(idx)
-writer = TableWriter(output, None, fields + ['FREQ'])
+writer = TableWriter(Frequency, None, fields + ['FREQ'])
 
 counts = {}
 feats = processing.features(layer)