diff --git a/src/extract_otp_secrets.py b/src/extract_otp_secrets.py
index bdc5a09..4d414ff 100644
--- a/src/extract_otp_secrets.py
+++ b/src/extract_otp_secrets.py
@@ -133,7 +133,11 @@ def main(sys_args: list[str]) -> None:
     # allow to use sys.stdout with with (avoid closing)
     sys.stdout.close = lambda: None  # type: ignore
     # set encoding to utf-8, needed for Windows
-    sys.stdout.reconfigure(encoding='utf-8')  # type: ignore
+    try:
+        sys.stdout.reconfigure(encoding='utf-8')  # type: ignore
+    except AttributeError:  # '_io.StringIO' object has no attribute 'reconfigure'
+        # StringIO in tests do not have all attributes, ignore it
+        pass
 
     args = parse_args(sys_args)