diff --git a/src/util/psbt/error.rs b/src/util/psbt/error.rs
index 4f566d78..b1fd7337 100644
--- a/src/util/psbt/error.rs
+++ b/src/util/psbt/error.rs
@@ -55,9 +55,9 @@ pub enum Error {
     /// transaction.
     UnexpectedUnsignedTx {
         /// Expected
-        expected: Transaction,
+        expected: Box<Transaction>,
         /// Actual
-        actual: Transaction,
+        actual: Box<Transaction>,
     },
     /// Unable to parse as a standard SigHash type.
     NonStandardSigHashType(u32),
diff --git a/src/util/psbt/map/global.rs b/src/util/psbt/map/global.rs
index 6587943e..32e19e05 100644
--- a/src/util/psbt/map/global.rs
+++ b/src/util/psbt/map/global.rs
@@ -169,8 +169,8 @@ impl Map for Global {
     fn merge(&mut self, other: Self) -> Result<(), psbt::Error> {
         if self.unsigned_tx != other.unsigned_tx {
             return Err(psbt::Error::UnexpectedUnsignedTx {
-                expected: self.unsigned_tx.clone(),
-                actual: other.unsigned_tx,
+                expected: Box::new(self.unsigned_tx.clone()),
+                actual: Box::new(other.unsigned_tx),
             });
         }