diff --git a/lib/std/os/linux/bpf.zig b/lib/std/os/linux/bpf.zig
index b2e39ec8427e8a4a69dbda87dc992a5a208446fb..6bad724ba6d204568e93f51512e451e11a57cdca 100644
--- a/lib/std/os/linux/bpf.zig
+++ b/lib/std/os/linux/bpf.zig
@@ -58,6 +58,12 @@ pub const JGT = 0x20;
 pub const JGE = 0x30;
 pub const JSET = 0x40;
 
+// misc fields
+/// copy A into X
+pub const TAX = 0x00;
+/// copy X into A
+pub const TXA = 0x80;
+
 //#define BPF_SRC(code)   ((code) & 0x08)
 pub const K = 0x00;
 pub const X = 0x08;