diff --git a/system/run.py b/system/run.py
index 6331a300..21f673c2 100755
--- a/system/run.py
+++ b/system/run.py
@@ -73,6 +73,7 @@ if __name__ == "__main__":
     if len(sys.argv) > 1:
         if sys.argv[1] == "--long":
             include_long_tests = True
+            tests = sys.argv[2:]
         else:
             tests = sys.argv[1:]
     run(include_long_tests, tests)