diff --git a/onionperf/onionperf b/onionperf/onionperf
index 461bbf4..f349942 100755
--- a/onionperf/onionperf
+++ b/onionperf/onionperf
@@ -168,12 +168,12 @@ def main():
         action="store", dest="tgenconnectport",
         default=8080)
 
-    measure_parser.add_argument('-i', '--onion-only',
+    measure_parser.add_argument('-o', '--onion-only',
         help="""disable measuring download times over Tor back to {0}""".format(hostname),
         action="store_false", dest="do_inet",
         default=True)
 
-    measure_parser.add_argument('-o', '--inet-only',
+    measure_parser.add_argument('-i', '--inet-only',
         help="""disable measuring download times over Tor to an ephemeral onion service""",
         action="store_false", dest="do_onion",
         default=True)