diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 326feb230170..cfbb038d150c 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -340,7 +340,7 @@ static const char *btf_type_str(const struct btf_type *t)
 struct btf_show {
 	u64 flags;
 	void *target;	/* target of show operation (seq file, buffer) */
-	void (*showfn)(struct btf_show *show, const char *fmt, va_list args);
+	__printf(2, 0) void (*showfn)(struct btf_show *show, const char *fmt, va_list args);
 	const struct btf *btf;
 	/* below are used during iteration */
 	struct {