diff --git a/ApplicationLibCode/ModelVisualization/Streamlines/RivStreamlinesPartMgr.h b/ApplicationLibCode/ModelVisualization/Streamlines/RivStreamlinesPartMgr.h
index 593b15bb6d..6eb5a5bddb 100644
--- a/ApplicationLibCode/ModelVisualization/Streamlines/RivStreamlinesPartMgr.h
+++ b/ApplicationLibCode/ModelVisualization/Streamlines/RivStreamlinesPartMgr.h
@@ -17,6 +17,8 @@
 /////////////////////////////////////////////////////////////////////////////////
 #pragma once
 
+#include "RiaDefines.h"
+
 #include "cvfObject.h"
 
 #include "cafPdmPointer.h"