diff --git a/Tools/autotest/common.py b/Tools/autotest/common.py
index 9536ac22d5..fd2faa0c84 100644
--- a/Tools/autotest/common.py
+++ b/Tools/autotest/common.py
@@ -6040,7 +6040,7 @@ Also, ignores heartbeats not from our target system'''
                     last_status = now
                     self.mavproxy.send('dataflash_logger status\n')
                     # seen on autotest: Active Rate(3s):97.790kB/s Block:164 Missing:0 Fixed:0 Abandoned:0
-                    self.mavproxy.expect("Active Rate\([0-9]s\):([0-9]+[.][0-9]+)")
+                    self.mavproxy.expect("Active Rate\([0-9]+s\):([0-9]+[.][0-9]+)")
                     rate = float(self.mavproxy.match.group(1))
                     self.progress("Rate: %f" % rate)
                     if rate < 50: