diff --git a/ssl/ssl_test.cc b/ssl/ssl_test.cc
index 3c2d852..eb45700 100644
--- a/ssl/ssl_test.cc
+++ b/ssl/ssl_test.cc
@@ -5070,6 +5070,22 @@
     SSL_CTX_set_max_proto_version(server_ctx_.get(), TLS1_3_VERSION);
     SSL_CTX_set_min_proto_version(client_ctx_.get(), TLS1_3_VERSION);
     SSL_CTX_set_max_proto_version(client_ctx_.get(), TLS1_3_VERSION);
+
+    static const uint8_t kALPNProtos[] = {0x03, 'f', 'o', 'o'};
+    ASSERT_EQ(SSL_CTX_set_alpn_protos(client_ctx_.get(), kALPNProtos,
+                                      sizeof(kALPNProtos)),
+              0);
+    SSL_CTX_set_alpn_select_cb(
+        server_ctx_.get(),
+        [](SSL *ssl, const uint8_t **out, uint8_t *out_len, const uint8_t *in,
+           unsigned in_len, void *arg) -> int {
+          return SSL_select_next_proto(
+                     const_cast<uint8_t **>(out), out_len, in, in_len,
+                     kALPNProtos, sizeof(kALPNProtos)) == OPENSSL_NPN_NEGOTIATED
+                     ? SSL_TLSEXT_ERR_OK
+                     : SSL_TLSEXT_ERR_NOACK;
+        },
+        nullptr);
   }
 
   static MockQUICTransport *TransportFromSSL(const SSL *ssl) {