diff --git a/include/internal/quic_txp.h b/include/internal/quic_txp.h
index db95b29307..31578bb178 100644
--- a/include/internal/quic_txp.h
+++ b/include/internal/quic_txp.h
@@ -179,6 +179,11 @@ void ossl_quic_tx_packetiser_set_msg_callback(OSSL_QUIC_TX_PACKETISER *txp,
 void ossl_quic_tx_packetiser_set_msg_callback_arg(OSSL_QUIC_TX_PACKETISER *txp,
                                                   void *msg_callback_arg);
 
+/*
+ * Determines the next PN which will be used for a given PN space.
+ */
+QUIC_PN ossl_quic_tx_packetiser_get_next_pn(OSSL_QUIC_TX_PACKETISER *txp,
+                                            uint32_t pn_space);
 # endif
 
 #endif
diff --git a/ssl/quic/quic_txp.c b/ssl/quic/quic_txp.c
index f117b246aa..08f3d7f7b6 100644
--- a/ssl/quic/quic_txp.c
+++ b/ssl/quic/quic_txp.c
@@ -2385,3 +2385,12 @@ void ossl_quic_tx_packetiser_set_msg_callback_arg(OSSL_QUIC_TX_PACKETISER *txp,
 {
     txp->msg_callback_arg = msg_callback_arg;
 }
+
+QUIC_PN ossl_quic_tx_packetiser_get_next_pn(OSSL_QUIC_TX_PACKETISER *txp,
+                                            uint32_t pn_space)
+{
+    if (pn_space >= QUIC_PN_SPACE_NUM)
+        return UINT64_MAX;
+
+    return txp->next_pn[pn_space];
+}