diff --git a/tests/api.c b/tests/api.c
index 185ff56e7..60fd9eeda 100644
--- a/tests/api.c
+++ b/tests/api.c
@@ -31442,6 +31442,7 @@ static int test_wolfSSL_ASN1_OBJECT(void)
     AssertNotNull(a = wolfSSL_ASN1_OBJECT_dup(&s));
     ASN1_OBJECT_free(a);
     s.obj = der;
+    s.objSz = sizeof(der);
     AssertNotNull(a = wolfSSL_ASN1_OBJECT_dup(&s));
     ASN1_OBJECT_free(a);
     ASN1_OBJECT_free(&s);