diff --git a/src/corelib/mimetypes/qmimedatabase.cpp b/src/corelib/mimetypes/qmimedatabase.cpp
index f1d0dc859e..d65f1bdebd 100644
--- a/src/corelib/mimetypes/qmimedatabase.cpp
+++ b/src/corelib/mimetypes/qmimedatabase.cpp
@@ -48,7 +48,6 @@
 
 #include <QtCore/QFile>
 #include <QtCore/QFileInfo>
-#include <QtCore/QSet>
 #include <QtCore/QStandardPaths>
 #include <QtCore/QBuffer>
 #include <QtCore/QUrl>