diff --git a/src/plugins/private_headers.pri b/src/plugins/private_headers.pri
index 1cd82cf278be0806b94b3ed14a515ac456408f68..2563df5c26e6bbe73f97100582a38cc0d6e871c2 100644
--- a/src/plugins/private_headers.pri
+++ b/src/plugins/private_headers.pri
@@ -5,5 +5,6 @@ isEmpty(QT_PRIVATE_HEADERS) {
     INCLUDEPATH += $$quote($${QT_PRIVATE_HEADERS}) \
                    $$quote($${QT_PRIVATE_HEADERS}/QtDeclarative) \
                    $$quote($${QT_PRIVATE_HEADERS}/QtCore) \
-                   $$quote($${QT_PRIVATE_HEADERS}/QtScript)
+                   $$quote($${QT_PRIVATE_HEADERS}/QtScript) \
+                   $$quote($${QT_PRIVATE_HEADERS}/QtGui)
 }