diff --git a/buildbot/masters/datatracker/master.cfg b/buildbot/masters/datatracker/master.cfg
index 124774384..b5ff0caf5 100644
--- a/buildbot/masters/datatracker/master.cfg
+++ b/buildbot/masters/datatracker/master.cfg
@@ -115,7 +115,7 @@ class UnitTest(WarningCountingShellCommand):
                 # Counter
                 value = int(value)
                 value += self.step_status.getStatistic(kw, 0)
-            elif re.match("[0-9]+\.[0-9]+$"):
+            elif re.match("[0-9]+\.[0-9]+$", value):
                 # Runtime
                 value = float(value)
                 value += self.step_status.getStatistic(kw, 0)