diff --git a/src/musig.cpp b/src/musig.cpp
index 706874be2cf..4031b87d06d 100644
--- a/src/musig.cpp
+++ b/src/musig.cpp
@@ -119,10 +119,10 @@ bool MuSig2SecNonce::IsValid()
     return m_impl->IsValid();
 }
 
-uint256 MuSig2SessionID(const CPubKey& script_pubkey, const CPubKey& part_pubkey, const uint256& sighash)
+uint256 MuSig2SessionID(const CPubKey& script_pubkey, const CPubKey& part_pubkey, const uint256& sighash, const std::vector<uint8_t>& pubnonce)
 {
     HashWriter hasher;
-    hasher << script_pubkey << part_pubkey << sighash;
+    hasher << script_pubkey << part_pubkey << sighash << pubnonce;
     return hasher.GetSHA256();
 }
 
diff --git a/src/musig.h b/src/musig.h
index f518ae81ba2..1b86d116701 100644
--- a/src/musig.h
+++ b/src/musig.h
@@ -56,7 +56,11 @@ public:
     bool IsValid();
 };
 
-uint256 MuSig2SessionID(const CPubKey& script_pubkey, const CPubKey& part_pubkey, const uint256& sighash);
+/**
+ * Computes an arbitrary unique session ID to identify ongoing signing sessions.
+ * It is the SHA256 of the aggregate xonly key, the participant pubkey, the sighash, and the pubnonce
+ */
+uint256 MuSig2SessionID(const CPubKey& script_pubkey, const CPubKey& part_pubkey, const uint256& sighash, const std::vector<uint8_t>& pubnonce);
 
 std::optional<std::vector<uint8_t>> CreateMuSig2AggregateSig(const std::vector<CPubKey>& participants, const CPubKey& aggregate_pubkey, const std::vector<std::pair<uint256, bool>>& tweaks, const uint256& sighash, const std::map<CPubKey, std::vector<uint8_t>>& pubnonces, const std::map<CPubKey, uint256>& partial_sigs);
 
diff --git a/src/script/sign.cpp b/src/script/sign.cpp
index 6cbcf07e5e2..372ed03d8d9 100644
--- a/src/script/sign.cpp
+++ b/src/script/sign.cpp
@@ -123,7 +123,7 @@ std::vector<uint8_t> MutableTransactionSignatureCreator::CreateMuSig2Nonce(const
     if (out.empty()) return {};
 
     // Store the secnonce in the SigningProvider
-    provider.SetMuSig2SecNonce(MuSig2SessionID(script_pubkey, part_pubkey, *sighash), std::move(secnonce));
+    provider.SetMuSig2SecNonce(MuSig2SessionID(script_pubkey, part_pubkey, *sighash, out), std::move(secnonce));
 
     return out;
 }
@@ -156,7 +156,9 @@ bool MutableTransactionSignatureCreator::CreateMuSig2PartialSig(const SigningPro
     if (!sighash.has_value()) return false;
 
     // Retrieve the secnonce
-    uint256 session_id = MuSig2SessionID(script_pubkey, part_pubkey, *sighash);
+    auto part_pubnonce_it = pubnonces.find(part_pubkey);
+    if (part_pubnonce_it == pubnonces.end()) return false;
+    uint256 session_id = MuSig2SessionID(script_pubkey, part_pubkey, *sighash, part_pubnonce_it->second);
     std::optional<std::reference_wrapper<MuSig2SecNonce>> secnonce = provider.GetMuSig2SecNonce(session_id);
     if (!secnonce || !secnonce->get().IsValid()) return false;
 
diff --git a/src/wallet/scriptpubkeyman.h b/src/wallet/scriptpubkeyman.h
index 1bc5249ca81..06ee020a79c 100644
--- a/src/wallet/scriptpubkeyman.h
+++ b/src/wallet/scriptpubkeyman.h
@@ -299,7 +299,7 @@ private:
      * must be done in order to prevent nonce reuse.
      *
      * The session id is an arbitrary value set by the signer in order for the signing logic
-     * to find ongoing signing sessions. It is the SHA256 of aggregate xonly key, + participant pubkey + sighash.
+     * to find ongoing signing sessions, see MuSig2SessionID.
      */
     mutable std::map<uint256, MuSig2SecNonce> m_musig2_secnonces;