diff --git a/RTCP/Cobalt/OutputProc/src/MSWriterFile.h b/RTCP/Cobalt/OutputProc/src/MSWriterFile.h
index 9bbaba94bd4f776ca16aab26445c0abdaf0df396..dd82e4125a0a551f1f065715b0df9671af345cf1 100644
--- a/RTCP/Cobalt/OutputProc/src/MSWriterFile.h
+++ b/RTCP/Cobalt/OutputProc/src/MSWriterFile.h
@@ -25,7 +25,7 @@
 
 #include <CoInterface/StreamableData.h>
 #include "MSWriter.h"
-#include <Stream/FileStream.h>
+#include "FastFileStream.h"
 
 namespace LOFAR
 {
@@ -49,7 +49,7 @@ namespace LOFAR
       virtual size_t getDataSize();
 
     protected:
-      FileStream itsFile;
+      FastFileStream itsFile;
     };