diff --git a/examples/read_dumpfile b/examples/read_dumpfile
old mode 100644
new mode 100755
index 2238d2d28..ecddc65d9
--- a/examples/read_dumpfile
+++ b/examples/read_dumpfile
@@ -7,7 +7,7 @@ from libmproxy import flow
 import json
 import sys
 
-with open("logfile", "rb") as logfile:
+with open(sys.argv[1], "rb") as logfile:
     freader = flow.FlowReader(logfile)
     try:
         for f in freader.stream():