diff --git a/libMeasurement.py b/libMeasurement.py
index 66eb65f..043667d 100755
--- a/libMeasurement.py
+++ b/libMeasurement.py
@@ -238,7 +238,7 @@ def main():
     p.add_argument(
         '--verbose', '-v',
         default=False,
-        action="store_true"
+        action="store_true",
         help="if set, show detailed messages"
     )
     try: