diff --git a/src/dbus/CMakeLists.txt b/src/dbus/CMakeLists.txt
index f489eac2e37..57dbc3f3480 100644
--- a/src/dbus/CMakeLists.txt
+++ b/src/dbus/CMakeLists.txt
@@ -40,6 +40,8 @@ qt_internal_add_module(DBus
         qdbusxmlgenerator.cpp
         qdbusxmlparser.cpp qdbusxmlparser_p.h
         qtdbusglobal.h qtdbusglobal_p.h
+    NO_UNITY_BUILD_SOURCES
+        qdbusconnectionmanager.cpp # qt_windows.h clashing with "interface"
     DEFINES
         DBUS_API_SUBJECT_TO_CHANGE
         QT_NO_FOREACH