diff --git a/tools/testing/selftests/bpf/prog_tests/btf.c b/tools/testing/selftests/bpf/prog_tests/btf.c
index 95a2b80f0d175347bbfef80d8cfde3f69323d0ec..de1b5b9eb93a81695a390ea25453a53e794b8fab 100644
--- a/tools/testing/selftests/bpf/prog_tests/btf.c
+++ b/tools/testing/selftests/bpf/prog_tests/btf.c
@@ -3948,6 +3948,20 @@ static struct btf_raw_test raw_tests[] = {
 	.btf_load_err = true,
 	.err_str = "Invalid return type",
 },
+{
+	.descr = "decl_tag test #17, func proto, argument",
+	.raw_types = {
+		BTF_TYPE_ENC(NAME_TBD, BTF_INFO_ENC(BTF_KIND_DECL_TAG, 0, 0), 4), (-1),	/* [1] */
+		BTF_TYPE_ENC(0, BTF_INFO_ENC(BTF_KIND_PTR, 0, 0), 0), /* [2] */
+		BTF_FUNC_PROTO_ENC(0, 1),			/* [3] */
+			BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 1),
+		BTF_VAR_ENC(NAME_TBD, 2, 0),			/* [4] */
+		BTF_END_RAW,
+	},
+	BTF_STR_SEC("\0local\0tag1\0var"),
+	.btf_load_err = true,
+	.err_str = "Invalid arg#1",
+},
 {
 	.descr = "type_tag test #1",
 	.raw_types = {