diff --git a/metadapta.go b/metadapta.go
index 20074b3..503e8af 100644
--- a/metadapta.go
+++ b/metadapta.go
@@ -103,7 +103,7 @@ func (this *a) unlistTransactionSafe(id int64) {
 func (this *a) sendMessageSafe(trans int64, method uint16, data []byte) error {
 	this.sendLock.Lock()
 	defer this.sendLock.Unlock()
-	return encodeMessageA(this.underlying, trans, method, data)
+	return encodeMessageA(this.underlying, this.sizeLimit, trans, method, data)
 }
 
 func (this *a) receive() {
@@ -269,7 +269,16 @@ type incomingMessage struct {
 	payload []byte
 }
 
-func encodeMessageA(writer io.Writer, trans int64, method uint16, data []byte) error {
+func encodeMessageA(
+	writer    io.Writer,
+	sizeLimit int64,
+	trans     int64,
+	method    uint16,
+	data      []byte,
+) error {
+	if int64(len(data)) > sizeLimit {
+		return ErrPayloadTooLarge
+	}
 	buffer := make([]byte, 18 + len(data))
 	tape.EncodeI64(buffer[:8], trans)
 	tape.EncodeI16(buffer[8:10], method)