diff --git a/src/experiments/l4-sys/experiment.hpp b/src/experiments/l4-sys/experiment.hpp
index 24c2e1e33449d69bc8aa37a2d3aa2dd9d1d45a3f..45225591c039626dbe02906445cf350a7c0fdf3a 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;