diff --git a/distrho/extra/FileBrowserDialogImpl.cpp b/distrho/extra/FileBrowserDialogImpl.cpp
index a1b73737..bb15b3ac 100644
--- a/distrho/extra/FileBrowserDialogImpl.cpp
+++ b/distrho/extra/FileBrowserDialogImpl.cpp
@@ -48,6 +48,8 @@
 
 #ifdef FILE_BROWSER_DIALOG_DGL_NAMESPACE
 START_NAMESPACE_DGL
+using DISTRHO_NAMESPACE::ScopedPointer;
+using DISTRHO_NAMESPACE::String;
 #else
 START_NAMESPACE_DISTRHO
 #endif