diff --git a/src/view/theme_proxy.cpp b/src/view/theme_proxy.cpp
index f1b84f5d1..c7240b69b 100644
--- a/src/view/theme_proxy.cpp
+++ b/src/view/theme_proxy.cpp
@@ -5,6 +5,8 @@
 #include "view/theme_proxy.h"
 #include <DApplicationHelper>
 
+DGUI_USE_NAMESPACE
+
 ThemeProxy::ThemeProxy(QObject *parent)
     : QObject(parent)
 {