diff --git a/pandas/tests/indexes/datetimes/test_to_period.py b/pandas/tests/indexes/datetimes/test_to_period.py
index 5567f98c52211..ddbb43787abb4 100644
--- a/pandas/tests/indexes/datetimes/test_to_period.py
+++ b/pandas/tests/indexes/datetimes/test_to_period.py
@@ -43,7 +43,7 @@ def test_dti_to_period(self):
     @pytest.mark.parametrize("month", MONTHS)
     def test_to_period_quarterly(self, month):
         # make sure we can make the round trip
-        freq = "Q-{month}".format(month=month)
+        freq = f"Q-{month}"
         rng = period_range("1989Q3", "1991Q3", freq=freq)
         stamps = rng.to_timestamp()
         result = stamps.to_period(freq)