diff --git a/scripts-dev/definitions.py b/scripts-dev/definitions.py
index 934bc4a3d8f3e7ba884b56cf89b8648b22d8f13c..f0d0cd8a3f91b2c9f2bdf4fb98d8486a180a5eaf 100755
--- a/scripts-dev/definitions.py
+++ b/scripts-dev/definitions.py
@@ -102,7 +102,7 @@ if __name__ == '__main__':
         "--ignore", action="append", metavar="REGEXP", help="Ignore a pattern"
     )
     parser.add_argument(
-        "--pattern", nargs='+', action="append", metavar="REGEXP",
+        "--pattern", action="append", metavar="REGEXP",
         help="Search for a pattern"
     )
     parser.add_argument(