diff --git a/src/plugins/languageclient/baseclient.cpp b/src/plugins/languageclient/baseclient.cpp
index eb4a30d13c8..f46150e792e 100644
--- a/src/plugins/languageclient/baseclient.cpp
+++ b/src/plugins/languageclient/baseclient.cpp
@@ -645,6 +645,8 @@ bool BaseClient::sendWorkspceFolderChanges() const
 void BaseClient::parseData(const QByteArray &data)
 {
     const qint64 preWritePosition = m_buffer.pos();
+    if (!m_buffer.atEnd())
+        m_buffer.seek(preWritePosition + m_buffer.bytesAvailable());
     m_buffer.write(data);
     m_buffer.seek(preWritePosition);
     while (!m_buffer.atEnd()) {