diff --git a/picohttp/demoserver.c b/picohttp/demoserver.c
index 1bdc1102f..7b97d47c3 100644
--- a/picohttp/demoserver.c
+++ b/picohttp/demoserver.c
@@ -27,9 +27,7 @@
 #include "ws2ipdef.h"
 #pragma warning(disable:4100)
 #endif
-#include <picotls.h>
 #include "picoquic_internal.h"
-#include "tls_api.h"
 #include "h3zero.h"
 #include "democlient.h"
 #include "demoserver.h"
@@ -600,7 +598,7 @@ int picoquic_h09_server_callback(picoquic_cnx_t* cnx,
 }
 
 /* Callback from the TLS stack upon receiving a list of proposed ALPN in the Client Hello */
-size_t picoquic_demo_server_callback_select_alpn(picoquic_quic_t* quic, ptls_iovec_t* list, size_t count)
+size_t picoquic_demo_server_callback_select_alpn(picoquic_quic_t* quic, picoquic_iovec_t* list, size_t count)
 {
     size_t ret = count;
     picoquic_alpn_enum alpn_code = picoquic_alpn_undef;
diff --git a/picohttp/demoserver.h b/picohttp/demoserver.h
index 40d1814c3..025ebeb5a 100644
--- a/picohttp/demoserver.h
+++ b/picohttp/demoserver.h
@@ -72,7 +72,7 @@ int picoquic_h09_server_callback(picoquic_cnx_t* cnx,
  * according to the ALPN selected by the client
  */
 
-size_t picoquic_demo_server_callback_select_alpn(picoquic_quic_t* quic, ptls_iovec_t* list, size_t count);
+size_t picoquic_demo_server_callback_select_alpn(picoquic_quic_t* quic, picoquic_iovec_t* list, size_t count);
 
 int demo_server_is_path_sane(const uint8_t* path, size_t path_length);
 
diff --git a/picoquic/picoquic.h b/picoquic/picoquic.h
index 086cdaac1..f8a29e3b3 100644
--- a/picoquic/picoquic.h
+++ b/picoquic/picoquic.h
@@ -452,6 +452,9 @@ typedef int (*picoquic_stream_data_cb_fn)(picoquic_cnx_t* cnx,
  */
 typedef size_t (*picoquic_alpn_select_fn)(picoquic_quic_t* quic, ptls_iovec_t* list, size_t count);
 
+/* V2 callback using picoquic_iovec_t instead of ptls_iovec_t */
+typedef size_t (*picoquic_alpn_select_fn_v2)(picoquic_quic_t* quic, picoquic_iovec_t* list, size_t count);
+
 /* Function used during callback to provision an ALPN context. The stack 
  * issues a callback of type 
  */
@@ -849,6 +852,9 @@ void picoquic_set_mtu_max(picoquic_quic_t* quic, uint32_t mtu_max);
 /* Set the ALPN function used to verify incoming ALPN */
 void picoquic_set_alpn_select_fn(picoquic_quic_t* quic, picoquic_alpn_select_fn alpn_select_fn);
 
+/* V2 API using picoquic_iovec_t */
+void picoquic_set_alpn_select_fn_v2(picoquic_quic_t* quic, picoquic_alpn_select_fn_v2 alpn_select_fn);
+
 /* Set the default callback function for new connections.
  * This must be defined for every server implementation.
  */
diff --git a/picoquic/picoquic_internal.h b/picoquic/picoquic_internal.h
index a4ec7cdd8..ed082a8cc 100644
--- a/picoquic/picoquic_internal.h
+++ b/picoquic/picoquic_internal.h
@@ -575,6 +575,7 @@ typedef struct st_picoquic_quic_t {
     struct st_picomask_fns_t* picomask_fns;
     char const* default_alpn;
     picoquic_alpn_select_fn alpn_select_fn;
+    picoquic_alpn_select_fn_v2 alpn_select_fn_v2;
     uint8_t reset_seed[PICOQUIC_RESET_SECRET_SIZE];
     uint8_t retry_seed[PICOQUIC_RETRY_SECRET_SIZE];
     uint64_t* p_simulated_time;
diff --git a/picoquic/quicctx.c b/picoquic/quicctx.c
index 42e7280e9..2b54091b1 100644
--- a/picoquic/quicctx.c
+++ b/picoquic/quicctx.c
@@ -4635,6 +4635,18 @@ void picoquic_set_alpn_select_fn(picoquic_quic_t* quic, picoquic_alpn_select_fn
     quic->alpn_select_fn = alpn_select_fn;
 }
 
+void picoquic_set_alpn_select_fn_v2(picoquic_quic_t* quic, picoquic_alpn_select_fn_v2 alpn_select_fn)
+{
+    if (quic->default_alpn != NULL) {
+        free((void *)quic->default_alpn);
+        quic->default_alpn = NULL;
+    }
+    quic->alpn_select_fn_v2 = alpn_select_fn;
+    if (alpn_select_fn != NULL) {
+        quic->alpn_select_fn = NULL;
+    }
+}
+
 void picoquic_set_default_callback(picoquic_quic_t* quic,
     picoquic_stream_data_cb_fn callback_fn, void* callback_ctx)
 {
diff --git a/picoquic/tls_api.c b/picoquic/tls_api.c
index 08ae3aa8e..9c163d1d0 100644
--- a/picoquic/tls_api.c
+++ b/picoquic/tls_api.c
@@ -1025,8 +1025,14 @@ int picoquic_client_hello_call_back(ptls_on_client_hello_t* on_hello_cb_ctx,
             }
         }
     }
-    else if (quic->alpn_select_fn != NULL) {
-        size_t selected = quic->alpn_select_fn(quic, params->negotiated_protocols.list, params->negotiated_protocols.count);
+    else {
+        size_t selected = params->negotiated_protocols.count;
+        if (quic->alpn_select_fn != NULL) {
+            selected = quic->alpn_select_fn(quic, params->negotiated_protocols.list, params->negotiated_protocols.count);
+        }
+        else if (quic->alpn_select_fn_v2 != NULL) {
+            selected = quic->alpn_select_fn_v2(quic, (picoquic_iovec_t*)params->negotiated_protocols.list, params->negotiated_protocols.count);
+        }
 
         if (selected < params->negotiated_protocols.count) {
             alpn_found = params->negotiated_protocols.list[selected].base;
diff --git a/picoquicfirst/picoquicdemo.c b/picoquicfirst/picoquicdemo.c
index e837b5d31..eeac9e29e 100644
--- a/picoquicfirst/picoquicdemo.c
+++ b/picoquicfirst/picoquicdemo.c
@@ -316,7 +316,7 @@ int quic_server(const char* server_name, picoquic_quic_config_t * config, int ju
             else {
                 picoquic_set_key_log_file_from_env(qserver);
 
-                picoquic_set_alpn_select_fn(qserver, picoquic_demo_server_callback_select_alpn);
+                picoquic_set_alpn_select_fn_v2(qserver, picoquic_demo_server_callback_select_alpn);
 
                 picoquic_use_unique_log_names(qserver, 1);
 
diff --git a/picoquictest/h3zerotest.c b/picoquictest/h3zerotest.c
index 9a1fb7e46..860c1f645 100644
--- a/picoquictest/h3zerotest.c
+++ b/picoquictest/h3zerotest.c
@@ -1843,7 +1843,7 @@ static int demo_server_test(char const * alpn, picoquic_stream_data_cb_fn server
      * We want to replace that by the demo client callback */
 
     if (ret == 0) {
-        picoquic_set_alpn_select_fn(test_ctx->qserver, picoquic_demo_server_callback_select_alpn);
+        picoquic_set_alpn_select_fn_v2(test_ctx->qserver, picoquic_demo_server_callback_select_alpn);
         picoquic_set_default_callback(test_ctx->qserver, NULL, server_param);
         picoquic_set_callback(test_ctx->cnx_client, picoquic_demo_client_callback, &callback_ctx);
         if (ret == 0) {
@@ -3153,7 +3153,7 @@ int http_stress_test_one(int do_corrupt, int do_drop, int initial_random)
             ret = -1;
         }
         else {
-            picoquic_set_alpn_select_fn(qserver, picoquic_demo_server_callback_select_alpn);
+            picoquic_set_alpn_select_fn_v2(qserver, picoquic_demo_server_callback_select_alpn);
             if (initial_random) {
                 picoquic_set_random_initial(qserver, 1);
             }
@@ -3679,7 +3679,7 @@ static int h3_grease_test_one(int server_test)
     * We want to replace that by the demo client callback */
 
     if (ret == 0) {
-        picoquic_set_alpn_select_fn(test_ctx->qserver, picoquic_demo_server_callback_select_alpn);
+        picoquic_set_alpn_select_fn_v2(test_ctx->qserver, picoquic_demo_server_callback_select_alpn);
         picoquic_set_default_callback(test_ctx->qserver, h3zero_callback, server_param);
         picoquic_set_callback(test_ctx->cnx_client, picoquic_demo_client_callback, &callback_ctx);
         if (ret == 0) {
diff --git a/picoquictest/webtransport_test.c b/picoquictest/webtransport_test.c
index 4770b2baa..64bdddac6 100644
--- a/picoquictest/webtransport_test.c
+++ b/picoquictest/webtransport_test.c
@@ -181,7 +181,7 @@ static int picowt_baton_test_one(
             server_param.path_table = path_item_list;
             server_param.path_table_nb = 1;
 
-            picoquic_set_alpn_select_fn(test_ctx->qserver, picoquic_demo_server_callback_select_alpn);
+            picoquic_set_alpn_select_fn_v2(test_ctx->qserver, picoquic_demo_server_callback_select_alpn);
             picoquic_set_default_callback(test_ctx->qserver, h3zero_callback, &server_param);
         }
     }
diff --git a/pqbench_app/pqbench.c b/pqbench_app/pqbench.c
index bb0179580..4c65d11cf 100644
--- a/pqbench_app/pqbench.c
+++ b/pqbench_app/pqbench.c
@@ -212,11 +212,10 @@ static int server_loop_cb(picoquic_quic_t* quic, picoquic_packet_loop_cb_enum cb
 */
 
 /* Callback from the TLS stack upon receiving a list of proposed ALPN in the Client Hello */
-size_t pqb_server_callback_select_alpn(picoquic_quic_t* quic, ptls_iovec_t* ptls_list, size_t count)
+size_t pqb_server_callback_select_alpn(picoquic_quic_t* quic, picoquic_iovec_t* list, size_t count)
 {
     size_t ret = count;
     picoquic_cnx_t* cnx = picoquic_get_cnx_in_progress(quic);
-    picoquic_iovec_t* list = (picoquic_iovec_t*)ptls_list;
 
     for (size_t i = 0; i < count; i++) {
         if ((const char*)list[i].base != NULL &&
@@ -253,7 +252,7 @@ int pqb_server(picoquic_quic_config_t* config)
     else {
         picoquic_set_key_log_file_from_env(qserver);
 
-        picoquic_set_alpn_select_fn(qserver, pqb_server_callback_select_alpn);
+        picoquic_set_alpn_select_fn_v2(qserver, pqb_server_callback_select_alpn);
 
         if (config->qlog_dir != NULL)
         {