diff --git a/args.go b/args.go
index f21470a..a563a25 100644
--- a/args.go
+++ b/args.go
@@ -9,7 +9,7 @@ type (
 
 	SMSSendArgs struct {
 		PhoneNumber string `validate:"e164" arg:"-p,--phone,required" help:"Receiver's phone number"`
-		Message     string `validate:"alphanum" arg:"-m,--msg,required" help:"Message to be sent"`
+		Message     string `validate:"printascii" arg:"-m,--msg,required" help:"Message to be sent"`
 	}
 
 	SMSReadArgs struct {
diff --git a/mcli.go b/mcli.go
index e7f11b0..f7cad0b 100644
--- a/mcli.go
+++ b/mcli.go
@@ -108,6 +108,7 @@ func run() error {
 		case args.SMS.Send != nil:
 			err := validate.Struct(args.SMS.Send)
 			if err != nil {
+				logger.With("err", err.Error()).Debug("sms send validation error")
 				parser.FailSubcommand("Unknown values or action", "sms")
 			}