diff --git a/indra/llfilesystem/llfilesystem.cpp b/indra/llfilesystem/llfilesystem.cpp
index 83b5d36f0e280e252eff9bc4fcb494273bd5d8ce..12901cb91ff65dbc5b7a969bc4e0177f6cb2c83e 100644
--- a/indra/llfilesystem/llfilesystem.cpp
+++ b/indra/llfilesystem/llfilesystem.cpp
@@ -34,6 +34,8 @@
 #include "llfasttimer.h"
 #include "lldiskcache.h"
 
+#include <boost/filesystem.hpp>
+
 static LLTrace::BlockTimerStatHandle FTM_VFILE_WAIT("VFile Wait");
 
 LLFileSystem::LLFileSystem(const LLUUID& file_id, const LLAssetType::EType file_type, S32 mode)