diff --git a/LCS/Common/include/Common/Exception.h b/LCS/Common/include/Common/Exception.h
index 7a0cd139f5c482666d677df449fa194f657281cc..71f96da40ade55b0f34fb46c97b762cc242bbfb1 100644
--- a/LCS/Common/include/Common/Exception.h
+++ b/LCS/Common/include/Common/Exception.h
@@ -188,7 +188,7 @@ namespace LOFAR
   public:							\
     excp(const std::string& text, const std::string& file="",	\
          int line=0, const std::string& function="",		\
-         Backtrace* bt=0) :					\
+         LOFAR::Backtrace* bt=0) :					\
       super(text, file, line, function, bt) {}			\
       virtual const std::string& type() const {			\
         static const std::string itsType(#excp);		\