diff --git a/include/sys/prctl.h b/include/sys/prctl.h
index 24f4f8bd..aa0c7a88 100644
--- a/include/sys/prctl.h
+++ b/include/sys/prctl.h
@@ -130,6 +130,12 @@ struct prctl_mm_map {
 #define PR_CAP_AMBIENT_LOWER    3
 #define PR_CAP_AMBIENT_CLEAR_ALL 4
 
+#define PR_SVE_SET_VL           50
+#define PR_SVE_SET_VL_ONEXEC (1 << 18)
+#define PR_SVE_GET_VL           51
+#define PR_SVE_VL_LEN_MASK 0xffff
+#define PR_SVE_VL_INHERIT (1 << 17)
+
 int prctl (int, ...);
 
 #ifdef __cplusplus