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-rw-r--r--giscanner/sourcescanner.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/giscanner/sourcescanner.py b/giscanner/sourcescanner.py
index 9a814213..15ced3f5 100644
--- a/giscanner/sourcescanner.py
+++ b/giscanner/sourcescanner.py
@@ -236,7 +236,7 @@ class SourceScanner(object):
('-U', undefines)]:
for arg in (args or []):
opt = prefix + arg
- if not opt in self._cpp_options:
+ if opt not in self._cpp_options:
self._cpp_options.append(opt)
def parse_files(self, filenames):