diff --git a/direct/src/interval/cIntervalManager.h b/direct/src/interval/cIntervalManager.h
index 3aa00d8049..8da0504c21 100644
--- a/direct/src/interval/cIntervalManager.h
+++ b/direct/src/interval/cIntervalManager.h
@@ -22,8 +22,7 @@
 #include "pmap.h"
 #include "vector_int.h"
 #include "pmutex.h"
-
-class EventQueue;
+#include "eventQueue.h"
 
 ////////////////////////////////////////////////////////////////////
 //       Class : CIntervalManager