diff --git a/3rdparty/openssl/crypto/asn1/t_spki.c b/3rdparty/openssl/crypto/asn1/t_spki.c
index 3bf48db5..1f83b316 100644
--- a/3rdparty/openssl/crypto/asn1/t_spki.c
+++ b/3rdparty/openssl/crypto/asn1/t_spki.c
@@ -90,7 +90,7 @@ int NETSCAPE_SPKI_print(BIO *out, NETSCAPE_SPKI *spki)
     }
     chal = spki->spkac->challenge;
     if (chal->length)
-        BIO_printf(out, "  Challenge String: %s\n", chal->data);
+        BIO_printf(out, "  Challenge String: %.*s\n", chal->length, chal->data);
     i = OBJ_obj2nid(spki->sig_algor->algorithm);
     BIO_printf(out, "  Signature Algorithm: %s",
                (i == NID_undef) ? "UNKNOWN" : OBJ_nid2ln(i));