diff --git a/src/musig.cpp b/src/musig.cpp
index b3329543127..85074796cbf 100644
--- a/src/musig.cpp
+++ b/src/musig.cpp
@@ -51,3 +51,14 @@ std::optional<CPubKey> MuSig2AggregatePubkeys(const std::vector<CPubKey>& pubkey
     }
     return GetCPubKeyFromMuSig2KeyAggCache(keyagg_cache);
 }
+
+CExtPubKey CreateMuSig2SyntheticXpub(const CPubKey& pubkey)
+{
+    CExtPubKey extpub;
+    extpub.nDepth = 0;
+    std::memset(extpub.vchFingerprint, 0, 4);
+    extpub.nChild = 0;
+    extpub.chaincode = MUSIG_CHAINCODE;
+    extpub.pubkey = pubkey;
+    return extpub;
+}
diff --git a/src/musig.h b/src/musig.h
index d46a67f65ec..0bc1f5ff6f1 100644
--- a/src/musig.h
+++ b/src/musig.h
@@ -23,4 +23,7 @@ std::optional<CPubKey> GetCPubKeyFromMuSig2KeyAggCache(secp256k1_musig_keyagg_ca
 //! Compute the full aggregate pubkey from the given participant pubkeys in their current order
 std::optional<CPubKey> MuSig2AggregatePubkeys(const std::vector<CPubKey>& pubkeys);
 
+//! Construct the BIP 328 synthetic xpub for a pubkey
+CExtPubKey CreateMuSig2SyntheticXpub(const CPubKey& pubkey);
+
 #endif // BITCOIN_MUSIG_H
diff --git a/src/script/descriptor.cpp b/src/script/descriptor.cpp
index 3a402702178..d0436702124 100644
--- a/src/script/descriptor.cpp
+++ b/src/script/descriptor.cpp
@@ -641,13 +641,7 @@ public:
             // Make our pubkey provider
             if (IsRangedDerivation() || !m_path.empty()) {
                 // Make the synthetic xpub and construct the BIP32PubkeyProvider
-                CExtPubKey extpub;
-                extpub.nDepth = 0;
-                std::memset(extpub.vchFingerprint, 0, 4);
-                extpub.nChild = 0;
-                extpub.chaincode = MUSIG_CHAINCODE;
-                extpub.pubkey = m_aggregate_pubkey.value();
-
+                CExtPubKey extpub = CreateMuSig2SyntheticXpub(m_aggregate_pubkey.value());
                 m_aggregate_provider = std::make_unique<BIP32PubkeyProvider>(m_expr_index, extpub, m_path, m_derive, /*apostrophe=*/false);
             } else {
                 m_aggregate_provider = std::make_unique<ConstPubkeyProvider>(m_expr_index, m_aggregate_pubkey.value(), /*xonly=*/false);