diff --git a/tests/add_key.c b/tests/add_key.c
index 57f12bfd..5a077181 100644
--- a/tests/add_key.c
+++ b/tests/add_key.c
@@ -87,7 +87,7 @@ main(void)
 		const char *str;
 	} types[] = {
 		{ ARG_STR(NULL) },
-		{ (const char *) 0xfffffee1fffffbadULL, NULL },
+		{ bogus_type + sizeof(unterminated1), NULL },
 		{ bogus_type, NULL },
 		{ ARG_STR("\20\21\22\23\24") },
 		{ ARG_STR("user") },
@@ -98,7 +98,7 @@ main(void)
 		const char *str;
 	} descs[] = {
 		{ ARG_STR(NULL) },
-		{ (const char *) 0xfffff00dfffffca7ULL, NULL },
+		{ bogus_desc + sizeof(unterminated2), NULL },
 		{ bogus_desc, NULL },
 		{ ARG_STR("\25\26\27\30\31") },
 		{ ARG_STR("desc") },
@@ -111,7 +111,7 @@ main(void)
 		size_t plen;
 	} payloads[] = {
 		{ ARG_STR(NULL), 0 },
-		{ (const char *) 0xfffffacefffff157ULL, NULL,
+		{ bogus_payload + sizeof(unterminated3), NULL,
 			(size_t) 0xdeadbeefbadc0dedULL },
 		{ bogus_payload, _STR(""), 0 },
 		{ bogus_payload, _STR("\16\17\20\21\22"), 5 },