diff --git a/libc/kernel/uapi/linux/btf.h b/libc/kernel/uapi/linux/btf.h
index 21e7596..f22d637 100644
--- a/libc/kernel/uapi/linux/btf.h
+++ b/libc/kernel/uapi/linux/btf.h
@@ -91,7 +91,13 @@
 };
 enum {
   BTF_VAR_STATIC = 0,
-  BTF_VAR_GLOBAL_ALLOCATED,
+  BTF_VAR_GLOBAL_ALLOCATED = 1,
+  BTF_VAR_GLOBAL_EXTERN = 2,
+};
+enum btf_func_linkage {
+  BTF_FUNC_STATIC = 0,
+  BTF_FUNC_GLOBAL = 1,
+  BTF_FUNC_EXTERN = 2,
 };
 struct btf_var {
   __u32 linkage;