diff --git a/src/mappers/242.cpp b/src/mappers/242.cpp
index 2fa41710..9636f0a0 100644
--- a/src/mappers/242.cpp
+++ b/src/mappers/242.cpp
@@ -24,12 +24,10 @@
 DECLFW(Mapper242_write)
 {
   ROM_BANK32((A>>3)&0xF);
-  switch(V&3)
+  switch((A>>1)&1)
   {
    case 0:MIRROR_SET(0);break;
    case 1:MIRROR_SET(1);break;
-   case 2:onemir(0);break;
-   case 3:onemir(1);break;
   }
 }