diff --git a/lib/std/builtin.zig b/lib/std/builtin.zig
index 3cb0cd9985a41d430315056a5181250cda7345ba..ccf948372ee695a7f27b5c72104ea71a66ab687f 100644
--- a/lib/std/builtin.zig
+++ b/lib/std/builtin.zig
@@ -473,7 +473,6 @@ pub const CallingConvention = union(enum(u8)) {
         mode: PrivilegeMode = .machine,
 
         pub const PrivilegeMode = enum(u2) {
-            user,
             supervisor,
             machine,
         };