diff --git a/arch/mips/isa_traits.hh b/arch/mips/isa_traits.hh
index 68ccf931dd..22ae76a442 100644
--- a/arch/mips/isa_traits.hh
+++ b/arch/mips/isa_traits.hh
@@ -473,6 +473,7 @@ namespace MipsISA
         //More Misc. Regs
         Hi,
         Lo,
+        FIR,
         FCSR,
         FPCR,