diff --git a/Tools/autotest/vehicle_test_suite.py b/Tools/autotest/vehicle_test_suite.py
index e752171665112..dbedb64d3d0a0 100644
--- a/Tools/autotest/vehicle_test_suite.py
+++ b/Tools/autotest/vehicle_test_suite.py
@@ -13676,7 +13676,7 @@ def GPSTypes(self):
             n = self.poll_home_position(timeout=120)
             distance = self.get_distance_int(orig, n)
             if distance > 1:
-                raise NotAchievedException("gps type %u misbehaving" % name)
+                raise NotAchievedException(f"gps type {name} misbehaving")
 
     def assert_gps_satellite_count(self, messagename, count):
         m = self.assert_receive_message(messagename)