diff --git a/Machines/MSX/Cartridges/ASCII16kb.hpp b/Machines/MSX/Cartridges/ASCII16kb.hpp
index 493894754..2b03ccbc3 100644
--- a/Machines/MSX/Cartridges/ASCII16kb.hpp
+++ b/Machines/MSX/Cartridges/ASCII16kb.hpp
@@ -23,7 +23,7 @@ class ASCII16kbROMSlotHandler: public ROMSlotHandler {
 //			printf("A16 %04x ", address);
 			switch(address >> 11) {
 				default:
-					confidence_counter_.add_miss();
+					if(pc_is_outside_bios) confidence_counter_.add_miss();
 				break;
 				case 0xc:
 					if(pc_is_outside_bios) {
diff --git a/Machines/MSX/Cartridges/ASCII8kb.hpp b/Machines/MSX/Cartridges/ASCII8kb.hpp
index ab214e59a..b9b9d5542 100644
--- a/Machines/MSX/Cartridges/ASCII8kb.hpp
+++ b/Machines/MSX/Cartridges/ASCII8kb.hpp
@@ -23,7 +23,7 @@ class ASCII8kbROMSlotHandler: public ROMSlotHandler {
 //			printf("A8 %04x ", address);
 			switch(address >> 11) {
 				default:
-					confidence_counter_.add_miss();
+					if(pc_is_outside_bios) confidence_counter_.add_miss();
 				break;
 				case 0xc:
 					if(pc_is_outside_bios) {