diff --git a/src/blockdata/transaction/mod.rs b/src/blockdata/transaction/mod.rs
index a9a45fa5e..8556a3d3b 100644
--- a/src/blockdata/transaction/mod.rs
+++ b/src/blockdata/transaction/mod.rs
@@ -508,6 +508,7 @@ impl Transaction {
 
             let (one, two) = result.split_at_mut(32);
             one.copy_from_slice(hash.as_inner());
+            one.reverse();
             let output_index_bytes: [u8; 4] = (output_index as u32).to_le_bytes();
             two.copy_from_slice(&output_index_bytes);
             result
diff --git a/src/blockdata/transaction/outpoint.rs b/src/blockdata/transaction/outpoint.rs
index 4cd013b9b..bf3d2b5ea 100644
--- a/src/blockdata/transaction/outpoint.rs
+++ b/src/blockdata/transaction/outpoint.rs
@@ -79,8 +79,10 @@ impl OutPoint {
 
 impl From<[u8; 36]> for OutPoint {
     fn from(buffer: [u8; 36]) -> Self {
-        let tx_id: [u8; 32] = buffer[0..32].try_into().unwrap();
+        let mut tx_id: [u8; 32] = buffer[0..32].try_into().unwrap();
         let index: [u8; 4] = buffer[32..36].try_into().unwrap();
+        // Reverse the tx_id to match the endianness of Txid::from_inner
+        tx_id.reverse();
 
         Self {
             txid: Txid::from_inner(tx_id),
@@ -250,6 +252,7 @@ mod tests {
         tx.add_burn_output(10000, &pk_array);
 
         let mut expected_buf = tx.txid().as_inner().to_vec();
+        expected_buf.reverse();
         let mut expected_index = vec![0,0,0,0];
         // 0 serialized as 32 bits
         expected_buf.append(&mut expected_index);