diff --git a/include/sys/prctl.h b/include/sys/prctl.h
index aa0c7a88c64df078497a1ec81a317c8daca24144..af76408cccbd96d34a7eec3166fdf60f510d0126 100644
--- a/include/sys/prctl.h
+++ b/include/sys/prctl.h
@@ -136,6 +136,15 @@ struct prctl_mm_map {
 #define PR_SVE_VL_LEN_MASK 0xffff
 #define PR_SVE_VL_INHERIT (1 << 17)
 
+#define PR_GET_SPECULATION_CTRL 52
+#define PR_SET_SPECULATION_CTRL 53
+#define PR_SPEC_STORE_BYPASS 0
+#define PR_SPEC_NOT_AFFECTED 0
+#define PR_SPEC_PRCTL (1UL << 0)
+#define PR_SPEC_ENABLE (1UL << 1)
+#define PR_SPEC_DISABLE (1UL << 2)
+#define PR_SPEC_FORCE_DISABLE (1UL << 3)
+
 int prctl (int, ...);
 
 #ifdef __cplusplus