diff --git a/mslib/msui/multilayers.py b/mslib/msui/multilayers.py
index b1bb8fc3a..1cd38edb6 100644
--- a/mslib/msui/multilayers.py
+++ b/mslib/msui/multilayers.py
@@ -637,7 +637,7 @@ def _parse_vtimes(self):
             values = self.extents[self.vtime_name]["values"]
             self.allowed_valid_times = sorted(self.parent.dock_widget.parse_time_extent(values))
             while len(self.allowed_valid_times) > 1000:
-                logging.warning("Too many valid times (%s). discarding 90%.", len(self.allowed_valid_times))
+                logging.warning("Too many valid times (%s). discarding 90%%.", len(self.allowed_valid_times))
                 self.allowed_valid_times = self.allowed_valid_times[::10]
             self.vtimes = [_time.isoformat() + "Z" for _time in self.allowed_valid_times]
             if len(self.allowed_valid_times) == 0: