diff --git a/qemu/target/mips/cpu.h b/qemu/target/mips/cpu.h
index 305f4d16..f09769bb 100644
--- a/qemu/target/mips/cpu.h
+++ b/qemu/target/mips/cpu.h
@@ -535,6 +535,7 @@ struct CPUMIPSState {
  */
     target_ulong CP0_Context;
     target_ulong CP0_KScratch[MIPS_KSCRATCH_NUM];
+    int32_t CP0_MemoryMapID;
 /*
  * CP0 Register 5
  */