diff --git a/Alignment/Geners/interface/RPBufferReference.hh b/Alignment/Geners/interface/RPBufferReference.hh
index 15d9e57495bc3..296421d9dc137 100644
--- a/Alignment/Geners/interface/RPBufferReference.hh
+++ b/Alignment/Geners/interface/RPBufferReference.hh
@@ -2,6 +2,7 @@
 #define GENERS_RPBUFFERREFERENCE_HH_
 
 #include "Alignment/Geners/interface/AbsReference.hh"
+#include "Alignment/Geners/interface/CharBuffer.hh"
 #include "Alignment/Geners/interface/streamposIO.hh"
 
 namespace gs {