diff --git a/auth.go b/auth.go
index ebca33e..cc3b042 100755
--- a/auth.go
+++ b/auth.go
@@ -53,7 +53,7 @@ func VerifyPass(ctx *AuthCtx, user, password string) (bool, error) {
 	} else if runtime.GOOS == "freebsd" {
 		pwFileName = "/etc/master.passwd"
 	} else {
-		pwFileName = "unsupported"
+		return false, errors.New("Unsupported platform")
 	}
 	pwFileData, e := ctx.reader(pwFileName)
 	if e != nil {