diff --git a/unlink-services.py b/unlink-services.py
index 7594032c..b9d3c79a 100755
--- a/unlink-services.py
+++ b/unlink-services.py
@@ -7,7 +7,7 @@ import yaml
 # - with 1 parameter, the same file will be used for in and out
 # - with 2 parameters, the 1st is the input, the 2nd the output
 input_file = sys.argv[1]
-output_file = sys.argv[:1]
+output_file = sys.argv[-1]
 
 stack = yaml.load(open(input_file))