diff --git a/python/fusion_engine_client/applications/p1_capture.py b/python/fusion_engine_client/applications/p1_capture.py
index f9ff5c21..9f267bdc 100755
--- a/python/fusion_engine_client/applications/p1_capture.py
+++ b/python/fusion_engine_client/applications/p1_capture.py
@@ -142,7 +142,7 @@ def main():
 
     # Open the output file if logging was requested.
     if options.output is not None:
-        if options.format == 'p1log':
+        if options.output_format == 'p1log':
             p1i_path = os.path.splitext(options.output)[0] + '.p1i'
             if os.path.exists(p1i_path):
                 os.remove(p1i_path)
@@ -151,9 +151,9 @@ def main():
     else:
         output_file = None
 
-    generating_raw_log = (output_file is not None and options.format == 'raw')
-    generating_p1log = (output_file is not None and options.format == 'p1log')
-    generating_csv = (output_file is not None and options.format == 'csv')
+    generating_raw_log = (output_file is not None and options.output_format == 'raw')
+    generating_p1log = (output_file is not None and options.output_format == 'p1log')
+    generating_csv = (output_file is not None and options.output_format == 'csv')
 
     if generating_csv:
         output_file.write(b'host_time,type,p1_time,sys_time\n')