diff --git a/arch/aarch64/bits/mman.h b/arch/aarch64/bits/mman.h
index 6d9d8850..8fad5ceb 100644
--- a/arch/aarch64/bits/mman.h
+++ b/arch/aarch64/bits/mman.h
@@ -1 +1,2 @@
 #define PROT_BTI 0x10
+#define PROT_MTE 0x20