diff --git a/app.go b/app.go
index 5838890..7ed9d2e 100644
--- a/app.go
+++ b/app.go
@@ -136,7 +136,7 @@ func NewHeadscale(cfg *Config) (*Headscale, error) {
 		)
 
 		if !cfg.DBssl {
-			dbString = dbString + " sslmode=disable"
+			dbString += " sslmode=disable"
 		}
 
 		if cfg.DBport != 0 {