diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h
index 57247240a20ad96e28add6abb909c8d3264b48a1..9cabc8b620e3395f927c551bfd7b5be00f87b89a 100644
--- a/tools/lib/bpf/btf.h
+++ b/tools/lib/bpf/btf.h
@@ -164,6 +164,7 @@ struct btf_dump_emit_type_decl_opts {
 	int indent_level;
 	/* strip all the const/volatile/restrict mods */
 	bool strip_mods;
+	size_t :0;
 };
 #define btf_dump_emit_type_decl_opts__last_field strip_mods