diff --git a/tests/qtest/bios-tables-test.c b/tests/qtest/bios-tables-test.c
index 93c9d306b5..4ccbe56158 100644
--- a/tests/qtest/bios-tables-test.c
+++ b/tests/qtest/bios-tables-test.c
@@ -1101,7 +1101,8 @@ static void test_acpi_tcg_tpm(const char *machine, const char *tpm_if,
     TPMTestState test;
     test_data data;
     GThread *thread;
-    char *args, *variant = g_strdup_printf(".%s", tpm_if);
+    const char *suffix = tpm_version == TPM_VERSION_2_0 ? "tpm2" : "tpm12";
+    char *args, *variant = g_strdup_printf(".%s.%s", tpm_if, suffix);
 
     tpm_tis_base_addr = base;