diff --git a/tools/nextwks-tool/main.go b/tools/nextwks-tool/main.go
index aace72a..d82dbcc 100644
--- a/tools/nextwks-tool/main.go
+++ b/tools/nextwks-tool/main.go
@@ -164,8 +164,8 @@ func obtainCertsLego(domains []string, email, backupDir, legoDir, legoPath strin
 		return fmt.Errorf("creating lego dir: %w", err)
 	}
 
-	// Build lego args
-	args := []string{
+	// Build lego args (v5+: flags go after the command)
+	args := []string{"run",
 		"--email", email,
 		"--http",
 		"--http.port", ":80",
@@ -175,7 +175,6 @@ func obtainCertsLego(domains []string, email, backupDir, legoDir, legoPath strin
 	for _, d := range domains {
 		args = append(args, "--domains", d)
 	}
-	args = append(args, "run")
 
 	cmd := exec.Command(legoPath, args...)
 	cmd.Stdout = os.Stdout