diff --git a/IO/IOSS/vtkIOSSUtilities.cxx b/IO/IOSS/vtkIOSSUtilities.cxx
index 26470b965..bee76107a 100644
--- a/IO/IOSS/vtkIOSSUtilities.cxx
+++ b/IO/IOSS/vtkIOSSUtilities.cxx	
@@ -38,6 +38,7 @@
 #include <Ioss_NodeBlock.h>
 #include <Ioss_SideBlock.h>
 #include <Ioss_SideSet.h>
+#include <Iotr_Factory.h>
 
 #include <memory>