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-rw-r--r--giscanner/docmain.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/giscanner/docmain.py b/giscanner/docmain.py
index 1ca92a14..0ee85ff2 100644
--- a/giscanner/docmain.py
+++ b/giscanner/docmain.py
@@ -39,7 +39,7 @@ def doc_main(args):
if not options.output:
raise SystemExit("missing output parameter")
if not os.path.isdir(options.output):
- raise SystemExit("wrong output parameter: %s", options.output)
+ raise SystemExit("wrong output parameter: %s" % (options.output,))
if len(args) < 2:
raise SystemExit("Need an input GIR filename")