diff --git a/vault/logical_system_activity.go b/vault/logical_system_activity.go
index 25dbf3847275..533a5b0a160e 100644
--- a/vault/logical_system_activity.go
+++ b/vault/logical_system_activity.go
@@ -93,7 +93,7 @@ func (b *SystemBackend) handleClientMetricQuery(ctx context.Context, req *logica
 	// Also convert any user inputs to UTC to avoid
 	// problems later.
 	if endTime.IsZero() {
-		endTime = timeutil.EndOfMonth(time.Now().UTC().AddDate(0, -1, 0))
+		endTime = timeutil.EndOfMonth(timeutil.StartOfPreviousMonth(time.Now().UTC()))
 	} else {
 		endTime = endTime.UTC()
 	}