diff --git a/wrappers/mtproto_intermediate.go b/wrappers/mtproto_intermediate.go
index 13e2d42..5b88d74 100644
--- a/wrappers/mtproto_intermediate.go
+++ b/wrappers/mtproto_intermediate.go
@@ -76,7 +76,7 @@ func (m *MTProtoIntermediate) Write(p []byte) (int, error) {
 		"counter", m.writeCounter,
 	)
 
-	if m.opts.ReadHacks.SimpleAck {
+	if m.opts.WriteHacks.SimpleAck {
 		return m.conn.Write(p)
 	}
 
diff --git a/wrappers/mtproto_intermediate_secure.go b/wrappers/mtproto_intermediate_secure.go
index ccffc90..b5aa362 100644
--- a/wrappers/mtproto_intermediate_secure.go
+++ b/wrappers/mtproto_intermediate_secure.go
@@ -36,7 +36,7 @@ func (m *MTProtoIntermediateSecure) Write(p []byte) (int, error) {
 		"counter", m.writeCounter,
 	)
 
-	if m.opts.ReadHacks.SimpleAck {
+	if m.opts.WriteHacks.SimpleAck {
 		return m.conn.Write(p)
 	}