diff --git a/lib/utils_benchmark.c b/lib/utils_benchmark.c
index 7a9736d8..24e7bccc 100644
--- a/lib/utils_benchmark.c
+++ b/lib/utils_benchmark.c
@@ -184,7 +184,7 @@ int crypt_benchmark_pbkdf_internal(struct crypt_device *cd,
 		pbkdf->parallel_threads = 0; /* N/A in PBKDF2 */
 		pbkdf->max_memory_kb = 0; /* N/A in PBKDF2 */
 
-		r = crypt_benchmark_pbkdf(cd, pbkdf, "foo", 3, "bar", 3,
+		r = crypt_benchmark_pbkdf(cd, pbkdf, "foo", 3, "01234567890abcdef", 16,
 					volume_key_size, &benchmark_callback, &u);
 		pbkdf->time_ms = ms_tmp;
 		if (r < 0) {
diff --git a/src/cryptsetup.c b/src/cryptsetup.c
index e529b7ac..37d35c92 100644
--- a/src/cryptsetup.c
+++ b/src/cryptsetup.c
@@ -860,7 +860,7 @@ static int action_benchmark_kdf(const char *kdf, const char *hash, size_t key_si
 			.time_ms = 1000,
 		};
 
-		r = crypt_benchmark_pbkdf(NULL, &pbkdf, "foo", 3, "bar", 3, key_size,
+		r = crypt_benchmark_pbkdf(NULL, &pbkdf, "foo", 3, "0123456789abcdef", 16, key_size,
 					&benchmark_callback, &pbkdf);
 		if (r < 0)
 			log_std(_("PBKDF2-%-9s     N/A\n"), hash);