diff --git a/ssl/bio_ssl.c b/ssl/bio_ssl.c
index 639b10556..a8260c9c4 100644
--- a/ssl/bio_ssl.c
+++ b/ssl/bio_ssl.c
@@ -407,6 +407,10 @@ static long ssl_ctrl(BIO *b, int cmd, long num, void *ptr)
             BIO_set_flags(b, BIO_FLAGS_IO_SPECIAL | BIO_FLAGS_SHOULD_RETRY);
             b->retry_reason = b->next_bio->retry_reason;
             break;
+        case SSL_ERROR_WANT_X509_LOOKUP:
+            BIO_set_retry_special(b);
+            b->retry_reason = BIO_RR_SSL_X509_LOOKUP;
+            break;
         default:
             break;
         }