diff --git a/masp_primitives/src/convert.rs b/masp_primitives/src/convert.rs
index d9fd728e..b5aa63ac 100644
--- a/masp_primitives/src/convert.rs
+++ b/masp_primitives/src/convert.rs
@@ -3,7 +3,7 @@ use crate::{
         pedersen_hash::{pedersen_hash, Personalization},
         Node, ValueCommitment,
     },
-    transaction::components::amount::{I32Sum, ValueSum},
+    transaction::components::amount::{I128Sum, ValueSum},
 };
 use borsh::{BorshDeserialize, BorshSerialize};
 use group::{Curve, GroupEncoding};
@@ -16,7 +16,7 @@ use std::{
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub struct AllowedConversion {
     /// The asset type that the note represents
-    assets: I32Sum,
+    assets: I128Sum,
     /// Memorize generator because it's expensive to recompute
     generator: jubjub::ExtendedPoint,
 }
@@ -71,15 +71,15 @@ impl AllowedConversion {
     }
 }
 
-impl From<AllowedConversion> for I32Sum {
-    fn from(allowed_conversion: AllowedConversion) -> I32Sum {
+impl From<AllowedConversion> for I128Sum {
+    fn from(allowed_conversion: AllowedConversion) -> I128Sum {
         allowed_conversion.assets
     }
 }
 
-impl From<I32Sum> for AllowedConversion {
+impl From<I128Sum> for AllowedConversion {
     /// Produces an asset generator without cofactor cleared
-    fn from(assets: I32Sum) -> Self {
+    fn from(assets: I128Sum) -> Self {
         let mut asset_generator = jubjub::ExtendedPoint::identity();
         for (asset, value) in assets.components() {
             // Compute the absolute value (failing if -i64::MAX is
@@ -123,7 +123,7 @@ impl BorshDeserialize for AllowedConversion {
     /// computation of checking whether the asset generator corresponds to the
     /// deserialized amount.
     fn deserialize_reader<R: io::Read>(reader: &mut R) -> io::Result<Self> {
-        let assets = I32Sum::read(reader)?;
+        let assets = I128Sum::read(reader)?;
         let gen_bytes =
             <<jubjub::ExtendedPoint as GroupEncoding>::Repr as BorshDeserialize>::deserialize_reader(reader)?;
         let generator = Option::from(jubjub::ExtendedPoint::from_bytes(&gen_bytes))
@@ -199,12 +199,12 @@ mod tests {
     #[test]
     fn test_homomorphism() {
         // Left operand
-        let a = ValueSum::from_pair(zec(), 5i32).unwrap()
-            + ValueSum::from_pair(btc(), 6i32).unwrap()
-            + ValueSum::from_pair(xan(), 7i32).unwrap();
+        let a = ValueSum::from_pair(zec(), 5i128).unwrap()
+            + ValueSum::from_pair(btc(), 6i128).unwrap()
+            + ValueSum::from_pair(xan(), 7i128).unwrap();
         // Right operand
-        let b =
-            ValueSum::from_pair(zec(), 2i32).unwrap() + ValueSum::from_pair(xan(), 10i32).unwrap();
+        let b = ValueSum::from_pair(zec(), 2i128).unwrap()
+            + ValueSum::from_pair(xan(), 10i128).unwrap();
         // Test homomorphism
         assert_eq!(
             AllowedConversion::from(a.clone() + b.clone()),
@@ -214,9 +214,9 @@ mod tests {
     #[test]
     fn test_serialization() {
         // Make conversion
-        let a: AllowedConversion = (ValueSum::from_pair(zec(), 5i32).unwrap()
-            + ValueSum::from_pair(btc(), 6i32).unwrap()
-            + ValueSum::from_pair(xan(), 7i32).unwrap())
+        let a: AllowedConversion = (ValueSum::from_pair(zec(), 5i128).unwrap()
+            + ValueSum::from_pair(btc(), 6i128).unwrap()
+            + ValueSum::from_pair(xan(), 7i128).unwrap())
         .into();
         // Serialize conversion
         let mut data = Vec::new();
diff --git a/masp_primitives/src/transaction/components/sapling/builder.rs b/masp_primitives/src/transaction/components/sapling/builder.rs
index c68449f9..b902e603 100644
--- a/masp_primitives/src/transaction/components/sapling/builder.rs
+++ b/masp_primitives/src/transaction/components/sapling/builder.rs
@@ -25,7 +25,7 @@ use crate::{
     transaction::{
         builder::Progress,
         components::{
-            amount::{I128Sum, I32Sum, ValueSum, MAX_MONEY},
+            amount::{I128Sum, ValueSum, MAX_MONEY},
             sapling::{
                 fees, Authorization, Authorized, Bundle, ConvertDescription, GrothProofBytes,
                 OutputDescription, SpendDescription,
@@ -438,7 +438,7 @@ impl<P: consensus::Parameters> SaplingBuilder<P> {
             self.convert_anchor = Some(merkle_path.root(node).into())
         }
 
-        let allowed_amt: I32Sum = allowed.clone().into();
+        let allowed_amt: I128Sum = allowed.clone().into();
         self.value_balance += I128Sum::from_sum(allowed_amt) * (value as i128);
 
         self.converts.push(ConvertDescriptionInfo {
diff --git a/masp_proofs/benches/convert.rs b/masp_proofs/benches/convert.rs
index 60fbbc74..0ac849fe 100644
--- a/masp_proofs/benches/convert.rs
+++ b/masp_proofs/benches/convert.rs
@@ -34,9 +34,9 @@ fn criterion_benchmark(c: &mut Criterion) {
         let output_asset = AssetType::new(format!("asset {}", i + 1).as_bytes()).unwrap();
         let mint_asset = AssetType::new(b"reward").unwrap();
 
-        let spend_value = -(i as i32 + 1);
-        let output_value = i as i32 + 1;
-        let mint_value = i as i32 + 1;
+        let spend_value = -(i as i128 + 1);
+        let output_value = i as i128 + 1;
+        let mint_value = i as i128 + 1;
 
         let allowed_conversion: AllowedConversion = (ValueSum::from_pair(spend_asset, spend_value)
             .unwrap()
diff --git a/masp_proofs/src/circuit/convert.rs b/masp_proofs/src/circuit/convert.rs
index c8bcb300..7fbcc88b 100644
--- a/masp_proofs/src/circuit/convert.rs
+++ b/masp_proofs/src/circuit/convert.rs
@@ -150,9 +150,9 @@ fn test_convert_circuit_with_bls12_381() {
         let output_asset = AssetType::new(format!("asset {}", i + 1).as_bytes()).unwrap();
         let mint_asset = AssetType::new(b"reward").unwrap();
 
-        let spend_value = -(i as i32 + 1);
-        let output_value = i as i32 + 1;
-        let mint_value = i as i32 + 1;
+        let spend_value = -(i as i128 + 1);
+        let output_value = i as i128 + 1;
+        let mint_value = i as i128 + 1;
 
         let allowed_conversion: AllowedConversion = (ValueSum::from_pair(spend_asset, spend_value)
             .unwrap()