diff --git a/src/libCom/cxxTemplates/tsBTree.h b/src/libCom/cxxTemplates/tsBTree.h
index 7a7583a57..29b7b9c9d 100644
--- a/src/libCom/cxxTemplates/tsBTree.h
+++ b/src/libCom/cxxTemplates/tsBTree.h
@@ -11,6 +11,7 @@
 #ifndef assert // allow use of epicsAssert.h
 #include <assert.h>
 #endif
+#include "locationException.h"
 
 //
 // tsBTreeRMRet