diff --git a/core-buffer/include/jungfrau.hpp b/core-buffer/include/jungfrau.hpp
index 305927e..e341e92 100644
--- a/core-buffer/include/jungfrau.hpp
+++ b/core-buffer/include/jungfrau.hpp
@@ -31,6 +31,8 @@ struct jungfrau_packet {
 };
 #pragma pack(pop)
 
+#define ModuleFrame_N_FIELDS 5
+
 #pragma pack(push)
 #pragma pack(1)
 struct ModuleFrame {
@@ -42,4 +44,5 @@ struct ModuleFrame {
 };
 #pragma pack(pop)
 
+
 #endif
\ No newline at end of file