diff --git a/cmd/certspotter/main.go b/cmd/certspotter/main.go
index 36c6496..1c21b1c 100644
--- a/cmd/certspotter/main.go
+++ b/cmd/certspotter/main.go
@@ -36,7 +36,7 @@ const defaultLogList = "https://loglist.certspotter.org/monitor.json"
 
 func certspotterVersion() string {
 	if Version != "" {
-		return Version
+		return Version + "?"
 	}
 	info, ok := debug.ReadBuildInfo()
 	if !ok {