diff --git a/eo/src/utils/eoFileMonitor.h b/eo/src/utils/eoFileMonitor.h
index 2ee42e8b..d4a21790 100644
--- a/eo/src/utils/eoFileMonitor.h
+++ b/eo/src/utils/eoFileMonitor.h
@@ -32,6 +32,7 @@ MS 25/11/00
 #define _eoFileMonitor_h
 
 #include <string>
+#include <fstream>
 
 #include <utils/eoMonitor.h>
 #include <eoObject.h>