diff --git a/example/tst_dvect2.py b/example/tst_dvect2.py
index 2e72bf8b..90d381a7 100644
--- a/example/tst_dvect2.py
+++ b/example/tst_dvect2.py
@@ -92,7 +92,7 @@ if (__name__ == "__main__"):
       argv = []
       
       for x in sys.argv:
-        if x != '--broken_auto_ptr':
+        if x != '--broken-auto-ptr':
           argv.append(x)
       broken_auto_ptr = argv != sys.argv
       sys.argv = argv
diff --git a/example/tst_ivect2.py b/example/tst_ivect2.py
index e7607151..a9e6aeef 100644
--- a/example/tst_ivect2.py
+++ b/example/tst_ivect2.py
@@ -92,7 +92,7 @@ if (__name__ == "__main__"):
       argv = []
       
       for x in sys.argv:
-        if x != '--broken_auto_ptr':
+        if x != '--broken-auto-ptr':
           argv.append(x)
       broken_auto_ptr = argv != sys.argv
       sys.argv = argv