diff --git a/lib/std/c/freebsd.zig b/lib/std/c/freebsd.zig
index d3fa8f51c7..e5cdc0e715 100644
--- a/lib/std/c/freebsd.zig
+++ b/lib/std/c/freebsd.zig
@@ -2172,6 +2172,30 @@ pub const PROC = struct {
     pub const WX_MAPPINGS_PERMIT = 0x0001;
     pub const WX_MAPPINGS_DISALLOW_EXEC = 0x0002;
     pub const WX_MAPPINGS_ENFORCE = 0x80000000;
+    pub const PROCCTL_MD_MIN = 0x10000000;
+    // x86_64-only constants
+    pub const KPTI = switch (builtin.cpu.arch) {
+        .x86_64 => struct {
+            pub const CTL = PROC.PROCCTL_MD_MIND;
+            pub const STATUS = PROC.PROCCTL_MD_MIND + 1;
+            pub const CTL_ENABLE_ON_EXEC = 1;
+            pub const CTL_DISABLE_ON_EXEC = 2;
+            pub const STATUS_ACTIVE = 0x80000000;
+        },
+        else => void,
+    };
+    pub const LA = switch (builtin.cpu.arch) {
+        .x86_64 => struct {
+            pub const CTL = PROC.PROCCTL_MD_MIND + 2;
+            pub const STATUS = PROC.PROCCTL_MD_MIND + 3;
+            pub const CTL_LA48_ON_EXEC = 1;
+            pub const CTL_LA57_ON_EXEC = 2;
+            pub const CTL_DEFAULT_ON_EXEC = 3;
+            pub const STATUS_LA48 = 0x01000000;
+            pub const STATUS_LA57 = 0x02000000;
+        },
+        else => void,
+    };
 };
 
 pub const PPROT = struct {