diff --git a/indra/llcommon/llprocess.h b/indra/llcommon/llprocess.h
index 2c6951b5627010ea991cdda5568a4825864d926b..06be0954c061ab0d121d31a4e6df52734a338659 100644
--- a/indra/llcommon/llprocess.h
+++ b/indra/llcommon/llprocess.h
@@ -291,7 +291,7 @@ class LL_COMMON_API LLProcess: public boost::noncopyable
 	std::string getPipeName(FILESLOT);
 
 	/// base of ReadPipe, WritePipe
-	class BasePipe
+	class LL_COMMON_API BasePipe
 	{
 	public:
 		virtual ~BasePipe() = 0;