diff --git a/forwarder.go b/forwarder.go
index c519ad2..db05677 100644
--- a/forwarder.go
+++ b/forwarder.go
@@ -39,7 +39,7 @@ func (pf *PortForwarder) forward() error {
 		return fmt.Errorf("failed to listen on %s: %w", localAddr, err)
 	}
 	defer listener.Close()
-	pf.logf("INFO", "Listener active on %s", localAddr)
+	pf.logf("INFO", fmt.Sprintf("Listener active on %s", localAddr))
 
 	for {
 		localConn, err := listener.Accept()