diff --git a/opppy/output.py b/opppy/output.py
index b90751c..20c478b 100644
--- a/opppy/output.py
+++ b/opppy/output.py
@@ -395,7 +395,7 @@ def thread_all(file_name, file_index, result_l):
     print('')
     print_dictionary_data(data)
 
-def build_output_dictionary_list(file_lists, opppy_parser):
+def build_output_dictionary_list(file_lists, opppy_parser, nthreads=0):
     '''
     append_pickle - 
       This function generates a opppy output dictionary
@@ -412,7 +412,7 @@ def build_output_dictionary_list(file_lists, opppy_parser):
         # build a new dictionary
         data = {}
         data['version'] = __version__
-        append_output_dictionary(data, output_files, opppy_parser)
+        append_output_dictionary(data, output_files, opppy_parser, nthreads=nthreads)
         dictionary_data.append(data)
     
     
diff --git a/opppy/tally.py b/opppy/tally.py
index 8a2b2d6..dc8a3c6 100644
--- a/opppy/tally.py
+++ b/opppy/tally.py
@@ -295,7 +295,7 @@ def thread_all(file_name, file_index, result_l):
     print('')
     print_tally_data(data)
 
-def build_tally_dictionary_list(file_lists, opppy_parser):
+def build_tally_dictionary_list(file_lists, opppy_parser, nthreads=0):
     '''
     append_pickle - 
       This function generates a opppy output dictionary
@@ -312,7 +312,7 @@ def build_tally_dictionary_list(file_lists, opppy_parser):
         # build a new dictionary
         data = {}
         data['version'] = __version__
-        append_tally_dictionary(data, output_files, opppy_parser)
+        append_tally_dictionary(data, output_files, opppy_parser, nthreads=nthreads)
         dictionary_data.append(data)