diff --git a/src/experiments/l4-sys/experiment.hpp b/src/experiments/l4-sys/experiment.hpp
index 24c2e1e3..45225591 100644
--- a/src/experiments/l4-sys/experiment.hpp
+++ b/src/experiments/l4-sys/experiment.hpp
@@ -8,7 +8,8 @@
 #include "util/Logger.hpp"
 #include "sal/Listener.hpp"
 
-#include "l4sys.pb.h"
+//#include "l4sys.pb.h"
+struct L4SysProtoMsg_Result;
 
 class L4SysExperimentData;