diff --git a/sysdeps/unix/sysv/linux/sys/prctl.h b/sysdeps/unix/sysv/linux/sys/prctl.h
index 7f748ebeeb..4d01379c23 100644
--- a/sysdeps/unix/sysv/linux/sys/prctl.h
+++ b/sysdeps/unix/sysv/linux/sys/prctl.h
@@ -21,6 +21,24 @@
 #include <features.h>
 #include <linux/prctl.h>  /*  The magic values come from here  */
 
+/* Recent extensions to linux which may post-date the kernel headers
+   we're picking up...  */
+
+/* Memory tagging control operations (for AArch64).  */
+#ifndef PR_TAGGED_ADDR_ENABLE
+# define PR_TAGGED_ADDR_ENABLE	(1UL << 8)
+#endif
+
+#ifndef PR_MTE_TCF_SHIFT
+# define PR_MTE_TCF_SHIFT	1
+# define PR_MTE_TCF_NONE	(0UL << PR_MTE_TCF_SHIFT)
+# define PR_MTE_TCF_SYNC	(1UL << PR_MTE_TCF_SHIFT)
+# define PR_MTE_TCF_ASYNC	(2UL << PR_MTE_TCF_SHIFT)
+# define PR_MTE_TCF_MASK	(3UL << PR_MTE_TCF_SHIFT)
+# define PR_MTE_TAG_SHIFT	3
+# define PR_MTE_TAG_MASK	(0xffffUL << PR_MTE_TAG_SHIFT)
+#endif
+
 __BEGIN_DECLS
 
 /* Control process execution.  */