diff --git a/src/psbt.h b/src/psbt.h
index 1fd186f6a56..a14df038378 100644
--- a/src/psbt.h
+++ b/src/psbt.h
@@ -89,7 +89,9 @@ struct PSBTProprietary
 template<typename Stream, typename... X>
 void SerializeToVector(Stream& s, const X&... args)
 {
-    WriteCompactSize(s, GetSerializeSizeMany(s.GetVersion(), args...));
+    SizeComputer sizecomp;
+    SerializeMany(sizecomp, args...);
+    WriteCompactSize(s, sizecomp.size());
     SerializeMany(s, args...);
 }
 
diff --git a/src/serialize.h b/src/serialize.h
index 002b749e385..9d8867fd643 100644
--- a/src/serialize.h
+++ b/src/serialize.h
@@ -1126,14 +1126,6 @@ size_t GetSerializeSize(const T& t, int nVersion = 0)
     return (SizeComputer() << t).size();
 }
 
-template <typename... T>
-size_t GetSerializeSizeMany(int nVersion, const T&... t)
-{
-    SizeComputer sc;
-    SerializeMany(sc, t...);
-    return sc.size();
-}
-
 /** Wrapper that overrides the GetParams() function of a stream (and hides GetVersion/GetType). */
 template <typename Params, typename SubStream>
 class ParamsStream