diff --git a/Fwk/AppFwk/cafUserInterface/cafPdmUiTreeSelectionQModel.cpp b/Fwk/AppFwk/cafUserInterface/cafPdmUiTreeSelectionQModel.cpp
index 805c845e0d..ada804a68c 100644
--- a/Fwk/AppFwk/cafUserInterface/cafPdmUiTreeSelectionQModel.cpp
+++ b/Fwk/AppFwk/cafUserInterface/cafPdmUiTreeSelectionQModel.cpp
@@ -44,6 +44,8 @@
 #include <QLabel>
 #include <QTreeView>
 
+#include <algorithm>
+
 
 //--------------------------------------------------------------------------------------------------
 ///