diff --git a/net/dns/nrpt_windows.go b/net/dns/nrpt_windows.go
index 1e1462e9e..6d9cf71b7 100644
--- a/net/dns/nrpt_windows.go
+++ b/net/dns/nrpt_windows.go
@@ -318,7 +318,7 @@ func (db *nrptRuleDatabase) writeNRPTRule(ruleID string, servers, doms []string)
 		}
 		defer key.Close()
 
-		if err := writeNRPTValues(key, strings.Join(servers, "; "), doms); err != nil {
+		if err := writeNRPTValues(key, strings.Join(servers, ";"), doms); err != nil {
 			return err
 		}
 	}