diff --git a/test/endecoder_legacy_test.c b/test/endecoder_legacy_test.c
index 121e2de3d4..943cba56e5 100644
--- a/test/endecoder_legacy_test.c
+++ b/test/endecoder_legacy_test.c
@@ -289,7 +289,8 @@ static int test_membio_str_eq(BIO *bio_provided, BIO *bio_legacy)
     long len_provided = BIO_get_mem_data(bio_provided, &str_provided);
     long len_legacy = BIO_get_mem_data(bio_legacy, &str_legacy);
 
-    return TEST_long_ge(len_provided, 0)
+    return TEST_long_ge(len_legacy, 0)
+           && TEST_long_ge(len_provided, 0)
            && TEST_strn2_eq(str_provided, len_provided,
                             str_legacy, len_legacy);
 }