diff --git a/Machines/MasterSystem/MasterSystem.cpp b/Machines/MasterSystem/MasterSystem.cpp
index bc3306686..e2cb42463 100644
--- a/Machines/MasterSystem/MasterSystem.cpp
+++ b/Machines/MasterSystem/MasterSystem.cpp
@@ -173,6 +173,7 @@ class ConcreteMachine:
 						}
 
 						if(write_pointers_[address >> 10]) write_pointers_[address >> 10][address & 1023] = *cycle.value;
+						else LOG("Ignored write to ROM");
 					break;
 
 					case CPU::Z80::PartialMachineCycle::Input: