diff --git a/src/libs/utils/qtcprocess.cpp b/src/libs/utils/qtcprocess.cpp
index 2d7a4bfb60a..309294403e4 100644
--- a/src/libs/utils/qtcprocess.cpp
+++ b/src/libs/utils/qtcprocess.cpp
@@ -204,6 +204,8 @@ public:
     void handleRest();
     void append(const QByteArray &text);
 
+    QByteArray readAllData() { return std::exchange(rawData, {}); }
+
     QByteArray rawData;
     QString incompleteLineBuffer; // lines not yet signaled
     QTextCodec *codec = nullptr; // Not owner
@@ -1501,16 +1503,12 @@ bool QtcProcess::waitForFinished(int msecs)
 
 QByteArray QtcProcess::readAllStandardOutput()
 {
-    QByteArray buf = d->m_stdOut.rawData;
-    d->m_stdOut.rawData.clear();
-    return buf;
+    return d->m_stdOut.readAllData();
 }
 
 QByteArray QtcProcess::readAllStandardError()
 {
-    QByteArray buf = d->m_stdErr.rawData;
-    d->m_stdErr.rawData.clear();
-    return buf;
+    return d->m_stdErr.readAllData();
 }
 
 qint64 QtcProcess::write(const QString &input)