diff --git a/pytest_repeat.py b/pytest_repeat.py
index e1d6e69a3..ec3551cca 100644
--- a/pytest_repeat.py
+++ b/pytest_repeat.py
@@ -57,7 +57,7 @@ def pytest_generate_tests(metafunc):
     if count > 1:
 
         def make_progress_id(i, n=count):
-            return '{0}/{1}'.format(i + 1, n)
+            return '{0}-{1}'.format(i + 1, n)
 
         scope = metafunc.config.option.repeat_scope
         metafunc.parametrize(