diff --git a/Machines/MasterSystem/MasterSystem.cpp b/Machines/MasterSystem/MasterSystem.cpp
index 1810f2eb3..ce98a0bf8 100644
--- a/Machines/MasterSystem/MasterSystem.cpp
+++ b/Machines/MasterSystem/MasterSystem.cpp
@@ -21,6 +21,8 @@
 #include "../../ClockReceiver/JustInTime.hpp"
 
 #include "../../Outputs/Speaker/Implementation/LowpassSpeaker.hpp"
+
+#define LOG_PREFIX "[SMS] "
 #include "../../Outputs/Log.hpp"
 
 #include "../../Analyser/Static/Sega/Target.hpp"