diff --git a/tests/mock-forgejo.py b/tests/mock-forgejo.py
index a0f2b49..475eef2 100755
--- a/tests/mock-forgejo.py
+++ b/tests/mock-forgejo.py
@@ -617,6 +617,7 @@ def main():
         sys.exit(1)
 
     print(f"Mock Forgejo server starting on port {port}", file=sys.stderr)
+    sys.stderr.flush()
 
     def shutdown_handler(signum, frame):
         global SHUTDOWN_REQUESTED