diff --git a/src/libs/clangsupport/connectionclient.cpp b/src/libs/clangsupport/connectionclient.cpp
index 2d7a3ee4526..2a3ec8af30e 100644
--- a/src/libs/clangsupport/connectionclient.cpp
+++ b/src/libs/clangsupport/connectionclient.cpp
@@ -103,20 +103,6 @@ void ConnectionClient::setProcessAliveTimerInterval(int processTimerInterval)
     m_processAliveTimer.setInterval(processTimerInterval);
 }
 
-QProcessEnvironment ConnectionClient::processEnvironment() const
-{
-    auto processEnvironment = QProcessEnvironment::systemEnvironment();
-
-    if (temporaryDirectory().isValid()) {
-        const QString temporaryDirectoryPath = temporaryDirectory().path();
-        processEnvironment.insert(QStringLiteral("TMPDIR"), temporaryDirectoryPath);
-        processEnvironment.insert(QStringLiteral("TMP"), temporaryDirectoryPath);
-        processEnvironment.insert(QStringLiteral("TEMP"), temporaryDirectoryPath);
-    }
-
-    return processEnvironment;
-}
-
 const QTemporaryDir &ConnectionClient::temporaryDirectory() const
 {
     return m_processCreator.temporaryDirectory();
diff --git a/src/libs/clangsupport/connectionclient.h b/src/libs/clangsupport/connectionclient.h
index 327275e0502..45797bd8922 100644
--- a/src/libs/clangsupport/connectionclient.h
+++ b/src/libs/clangsupport/connectionclient.h
@@ -31,7 +31,6 @@
 
 #include <QLocalServer>
 #include <QLocalSocket>
-#include <QProcessEnvironment>
 #include <QScopedPointer>
 #include <QTemporaryDir>
 
@@ -124,8 +123,6 @@ private:
 
     void ensureMessageIsWritten();
 
-    QProcessEnvironment processEnvironment() const;
-
 protected:
     ProcessCreator m_processCreator;