diff --git a/include/Framework/Bus.h b/include/Framework/Bus.h
index d6d3813..caba630 100644
--- a/include/Framework/Bus.h
+++ b/include/Framework/Bus.h
@@ -6,6 +6,7 @@
 #include <string>
 #include <unordered_map>
 #include <vector>
+#include <iostream>
 
 // ROOT
 #include "TBranchElement.h"