diff --git a/indra/llcommon/lleventfilter.cpp b/indra/llcommon/lleventfilter.cpp
index ae35fb9c8e..4cded7f88e 100644
--- a/indra/llcommon/lleventfilter.cpp
+++ b/indra/llcommon/lleventfilter.cpp
@@ -38,6 +38,7 @@
 #include "llerror.h"                // LL_ERRS
 #include "llsdutil.h"               // llsd_matches()
 #include "stringize.h"
+#include "lleventtimer.h"
 #include "lldate.h"
 
 /*****************************************************************************
diff --git a/indra/llcommon/lleventfilter.h b/indra/llcommon/lleventfilter.h
index 2e5d7bc825..f8df9dd63e 100644
--- a/indra/llcommon/lleventfilter.h
+++ b/indra/llcommon/lleventfilter.h
@@ -32,9 +32,9 @@
 #include "llevents.h"
 #include "stdtypes.h"
 #include "lltimer.h"
-#include "lleventtimer.h"
 #include <boost/function.hpp>
 
+class LLEventTimer;
 class LLDate;
 
 /**