diff --git a/CHANGELOG.md b/CHANGELOG.md
index 97c3b46..70317db 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - Orchard note nullifier calculation
+- Sapling spend field parsing
 
 ## [0.5.5.2]
 
diff --git a/librustzcash-wrapper/src/lib.rs b/librustzcash-wrapper/src/lib.rs
index e42f374..ab7c934 100644
--- a/librustzcash-wrapper/src/lib.rs
+++ b/librustzcash-wrapper/src/lib.rs
@@ -401,9 +401,9 @@ impl<RW> ToHaskell<RW> for HSBundle {
 
 impl HSBundle {
     pub fn from_bundle(sb: &SaplingBundle<SaplingAuthorized>) -> HSBundle {
-        let s = Cursor::new(Vec::new());
-        sb.authorization().binding_sig.write(s.clone()).unwrap();
-        return HSBundle {empty: false,  spends: Hspend::pack(sb.shielded_spends()) , outputs: HshieldedOutput::pack(sb.shielded_outputs()) , value: i64::from(sb.value_balance()) , sig: s.into_inner() }
+        let mut s: Vec<u8> = Vec::new();
+        sb.authorization().binding_sig.write(&mut s).unwrap();
+        return HSBundle {empty: false,  spends: Hspend::pack(sb.shielded_spends()) , outputs: HshieldedOutput::pack(sb.shielded_outputs()) , value: i64::from(sb.value_balance()) , sig: s }
     }
 }
 
@@ -428,11 +428,11 @@ impl Hspend {
     pub fn pack(sp: &[SpendDescription<SaplingAuthorized>]) -> Vec<Hspend> {
         let mut r = Vec::new();
         for s in sp {
-            let rk = Cursor::new(Vec::new());
-            let authsig = Cursor::new(Vec::new());
-            s.rk().write(rk.clone()).unwrap();
-            s.spend_auth_sig().write(authsig.clone()).unwrap();
-            r.push(Hspend {cv: Hhex{bytes:s.cv().to_bytes().to_vec()}, anchor: Hhex{bytes:s.anchor().to_bytes().to_vec()}, nullifier: Hhex{bytes:s.nullifier().to_vec()}, rk: Hhex{bytes: rk.into_inner()}, proof: Hhex{bytes:s.zkproof().to_vec()}, authsig: Hhex{bytes:authsig.into_inner()}});
+            let mut rk = Vec::new();
+            let mut authsig = Vec::new();
+            s.rk().write(&mut rk).unwrap();
+            s.spend_auth_sig().write(&mut authsig).unwrap();
+            r.push(Hspend {cv: Hhex{bytes:s.cv().to_bytes().to_vec()}, anchor: Hhex{bytes:s.anchor().to_bytes().to_vec()}, nullifier: Hhex{bytes:s.nullifier().to_vec()}, rk: Hhex{bytes: rk}, proof: Hhex{bytes:s.zkproof().to_vec()}, authsig: Hhex{bytes:authsig}});
         }
         return r
     }
diff --git a/test/Spec.hs b/test/Spec.hs
index 33be22a..5c6f3a5 100644
--- a/test/Spec.hs
+++ b/test/Spec.hs
@@ -798,7 +798,11 @@ main = do
         let h =
               hexString
                 "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"
+        let h1 =
+              hexString
+                "0400008085202f89014b6ded3d2ee43e54135c04f9a305b473d7d741bbe6f383aa636e03e948705e0d01000000fdfd0000483045022100b34ca0fb34959230b95a48e9de95521dc4c013bdc0e6bd2a77a67b373fadea42022030a1b13f16993ab212d9f674b7b8dd3c6723137c183dbd41a9bbfcf66d7811c40147304402200f0bd12663a52ccb5e6211ec633932bbc7f0151ab51194038534abf88f689025022051fe62591dfa11a96095b4aeee2114c77a0d773242939f7ac2fa8e5262ff0865014c6952210231ee0c161e846bc133ad41d295f560d7e24829415afc78ead24d4b10198bb7342103b0b11f2dd10611d06cd6232233678dce736ce2b2141c62bdf0b4fe6f79d736da21029cbeda22b05352f66a338561604cbe11e8332f836385f16abf5088045c39d4dd53aefdffffff02b63500000000000017a91499a8b5b1f3d3a1a12e92dd4f3d94bee8fc34c527873362fa020000000017a914d75fe4791fcd50f2874f1b7457fca5833293b3a38700000000000000000000000000000000000000"
         let t = readZebraTransaction h
+        let t1 = readZebraTransaction h1
         it "Transparent output is identified" $ do
           case t of
             Nothing -> assertFailure "Couldn't decode"
@@ -820,7 +824,27 @@ main = do
                             (\(TxOut v s) -> s) (head (tb_vout myTb'))
                       pkHash `shouldBe`
                         maybe "" (hexBytes . tr_bytes) (t_rec addr)
-              myTb `shouldNotBe` Nothing
+        it "Transparent input is identified" $ do
+          case t1 of
+            Nothing -> assertFailure "Couldn't decode"
+            Just t1' -> do
+              let tb1 = zt_tBundle t1'
+              print tb1
+              let txInHex =
+                    HexString
+                      "Km\237=.\228>T\DC3\\\EOT\249\163\ENQ\180s\215\215A\187\230\243\131\170cn\ETX\233Hp^\r"
+              toText txInHex `shouldBe` "Blank"
+        it "Sapling component is read" $ do
+          case t of
+            Nothing -> assertFailure "Couldn't decode"
+            Just t' -> do
+              let sb = zt_sBundle t'
+              fromRawSBundle sb `shouldNotBe` Nothing
+      describe "Raw transaction with Sap spend" $ do
+        let h =
+              hexString
+                "050000800a27a726b4d0d6c200000000c3c02a0000000111ac7f9600d034fec892f50600006b09ad88c990a8f3c5bffb6856beebd0ce356c5d1413c63a9a88db71c3f41dc12cd60197ee742fc75b217215e7144db48bd3fa55de211e0c8d7da70aba0efe17124b5250fc9fa095c8e50b53168142eb7ec402289a84ab762ddafb0f972fc07c61eb45249922752dfac17fd704a3b6156a6955286c04587f37fc781a9a0b28e92664dde2300c6321dd21d367c16b4c2b510e5d0a4358624e1ceb816da155e588726f783ed6bf396eaecada3d3bde7a0722419014c509a7fe264003af5388c5c8cdf2076137b26cf66383b41dea2af415f3d16767124616609b96789e2811f7bc8b36c0b746d225c0aa2c98b370fd39b2015eea43d523e5fbccc7ca127e59bc92ac8ad32d05243d278a26f07f33f45df23c3e8dd40d72af35a70068cc3f8445478c9cd3a56d3515e207a1b95c39c9d8b45e66827cf63e6018bf1012a47aa23ec0174735949f62036df3f677f92d3aa10365e2d358d92f77e9a6294c245eb8536493e8480f5215cdf7c863623727efa188fd8679f95318d0072915dc2be8e77b5778c48d3a2ea614990984c29dfaf7c582d269f0e9ffe6e3c475c99dbf5f8756c334b3c7b5954d68549c65fc2648bb389ba63397525829c48f7f32e43e866dfbc8ad86f54a867e592524f9c43b007328b78220cab4537c2d65f64c819ecc19ae09e17b3c84208cc169c2eaf8831d452dc83527a966b288aacce6f261aa8ed23e2c0613c48161c1eb0199915ee9c1f9cf0e7e5445539f5016b3ff701408b45557154a53e48998b49a2d149a67202caa6b585348b42fbeda770e084128760c742537743ba8cec4f997fe575db9cb370d89278c607a598ff06f1ece047855ea0a3d808d84272e22bcdeb2eb5bbe5754947be5d6fe42038d26f13313e039adf7e1091a901a6daa24b247b13c810eb5b50cd6040463c6bfa209a792d77eafb0f063167b11777d97ad05ca7eec1f1a45698e33f8e8b11a0ab0ad16ec10e4abba6de69255e0e00c7e712503a107012a46fcb9c5186a1fc5be96dcc279fa3dd18e69ee4a8ba75edaff105716b4751717aa818d514620ddd13a6716729417571a342dcc8a6f341d05db7614e729491095e4bcc6fbdec2908b6f74d7db81106ab2e1c0ee6217ba3cbb174232a42f2e6aba7e92eb2934dcd91c5a36eae1aac5160bf6076a39baeea84b8bad043c565eb8c4206a74b68c9342f9d7b1b31eec86bb9c5c73549313dd2cbe3bce55ecfdd952f3eb4dd5fa7c2000727b62a0faeb0fac1cf05246221c37560359c44610ee8f93cdd1179fc35fbd808152f507e790eb2140faccb2f6c9897a3a219d8752388e846c7277d82dc80850aeef2de46eb2d81563d53714d39e3553f5133abeae6c487d10664e1b10a90a5319adfa7471aa429095bd272ff4d3df227bdc6075e0cafba54201bddc44edcdfd2317f682f40a25e582273c4845b550b17724eca81e89268eafef9e98533b85bb2c54cdcb6beb4d6f2fc0459a2b36cbb43fcbab720678553fc930063c64a09445ff637c12d0ade4acdef1e19e8481a0b7c2dd968a2ceb7f50efbb76fe21f49d8829d8a26b10453626593a694586a828705c5ab02cccd60e351171aea3e1aaeda07cd960e0f5205019766ff3afe124a47f4ef16f0e671e1968e662c7974ee54872538c7019cc5396f165013f4c482d400ed4ff5fb34189c75e92d336cb25563867215dc3aa195f736e06657c9e27f1468acd580ee51ca44220be83c215c1223758a7676d376ea0d0aa74b73032b85a45f69e6f8d4ec3efb6861d5adc35f57e6112dfa7334ba6fbd64b14498a89d8596423125b6486d9208937e9aa010831edcc168be8b7abe7ac21cae4794fe5f019abe1715d5d8601b646767d396e1b7fb8ff50aa43d88a2426545270093ce80be1aaa849dd2edc0310e3cb0bc13a23108776a44e3250fe5aa89b6d62159206377e03e302e3dabff9ecd8675870c7d55e33cb915d7e73b765d1c61f9ba0d504429fe99516df0534cf6a5ad53424b9be39e4835dfb301ae5cbd9edd628f0cdb6c54bd4986a9fba65f60e833bf17b461746ffcc312d9584a55c55c42c8e760d017be56f54a4e1423648c3877f8a44e3a56c21bf2bf85550f3d8a8f040c8c6687aadb2c4d1e1613626a11d30fb25340f5f14b6a7752c5e6c7b866b10f1155360f35ddc8f07ed591fa3366948fbcde1a16c35a589457ded90b69675bad01a1fa9386e68dd2001498d41033a6effe882d9e864ea7991e0c71b3e65c158cba64014f800000000003b38927526d5fc5a1b2f16addcd4aa162272f280e977087de02ec2969f10d25ea3de9a5d3d3975b4b683897bf828be631813bd5b949ddf9c3c5b103b69aa483f5fc46485bc7a5dd51a47543f57d346e680e12d9429ef7c21cacf407656779235d205dffae23666e01d92fb18c063d1bd7cd00935f029149c7e20b3d72b1b951117f0629b1ef1e49047532a59fd8bc1817343d45e832078806eb10304b8e034fdce70464d33cf6c66e857fbda170573a7965f8eed58e6cb7edec4e9f8a666fbca0aeeca2d4d161caae23005f6e0adf6859c8f1bece409aa5d44d285a8e8e9fe86365af4e92384dce318724443e8a95cc790df47cdd3e8aa9ccf19acc5eb19b4cb517c3f63e59512c037a66312786cb6cd2bcd4480e0a21ac63a83b7b9c84d3207a6410aa51a60d15b5526e3ffb4cbb02ee9f43f7ce316ef01dd75544224481d4b8ad2a8944928e2b4432812d1b20aeae3b51808028321588952ea70afeef1709eff5a75463a2201299484ecc421c8452e1700ca9f4932b0aba6b5d46f36e80f2f0297eaf7f44a79cbd21046ca53073ee60d5f2ffe2352b2538326e3e7ed851e8a62612a9b974ceb5757835b974892b049a7a0c531390a4455657b5b5afc5f0f09f8bf838313f403c96c4c2c72c4ced6e642e86b0eff220c1cd3388ffc902af68f87a1b7e8920d7f014e6cd2694b926fcbef23dc645cd75b051add0fc2f99c0346d45c2521b27a00a13dc9754306222f54a2b4f3058e80e0821d6c78e5e80a509525631f34c343567513636855d1c318c49debc651212938c487e069c390868ce700c4d19e1e52eb7b536e1568d03421c3769b920224113bea4d345510bd0393efa1ec22b87e973c663be75c84e7278108ada31af0311796de927257f59823f1ee9955f0f39b618054476658c165ef443d169afe46007ac80a0efa3d678c2707a7a001812f02dac999796872d3328eeaab4b61cadb8be9c4ee0ff9104d417ba71076054735c12fabd5d78f6de83a57f46b8d071e3c273c60a226fa6d555fa3580002cf3b6f3e50a8f5616eef66e7bb28523858315b3cde381003ab885ece89973aa4e228cd5da0d24ebd876097e7664a2b903430963517bb895435703029ea30081a874d15f4997dec3b89cd728075a0b21d838a57052f02fad03c1a3f74427d149c6225b41339a00dd764b452fca190a0245e7118224965942e3a6d7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+        let t = readZebraTransaction h
         it "Sapling component is read" $ do
           case t of
             Nothing -> assertFailure "Couldn't decode"