diff --git a/src/libs/utils/json.cpp b/src/libs/utils/json.cpp
index d366fc3f0e1..4bf17cfd15b 100644
--- a/src/libs/utils/json.cpp
+++ b/src/libs/utils/json.cpp
@@ -29,7 +29,6 @@
 #include <utils/fileutils.h>
 
 #include <QDir>
-#include <QStringBuilder>
 #include <QDebug>
 #include <QJsonDocument>
 
diff --git a/src/plugins/cpptools/doxygengenerator.cpp b/src/plugins/cpptools/doxygengenerator.cpp
index 63a252e9920..c1e4d8bcf27 100644
--- a/src/plugins/cpptools/doxygengenerator.cpp
+++ b/src/plugins/cpptools/doxygengenerator.cpp
@@ -33,7 +33,6 @@
 #include <utils/fileutils.h>
 #include <utils/qtcassert.h>
 
-#include <QStringBuilder>
 #include <QTextDocument>
 #include <QDebug>
 
diff --git a/src/plugins/help/helpviewer.cpp b/src/plugins/help/helpviewer.cpp
index 964235d7367..41af34df19b 100644
--- a/src/plugins/help/helpviewer.cpp
+++ b/src/plugins/help/helpviewer.cpp
@@ -33,7 +33,6 @@
 #include <utils/temporarydirectory.h>
 
 #include <QFileInfo>
-#include <QStringBuilder>
 #include <QUrl>
 
 #include <QApplication>