diff --git a/coregrind/pub_core_basics.h b/coregrind/pub_core_basics.h
index 7ac5a72..9d7e6b4 100644
--- a/coregrind/pub_core_basics.h
+++ b/coregrind/pub_core_basics.h
@@ -96,6 +96,10 @@
             ULong r31;  /* Return address of the last subroutine call */
             ULong r28;
          } MIPS64;
+         struct {
+            ULong r52;
+            ULong r55;
+         } TILEGX;
       } misc;
    }
    UnwindStartRegs;