diff --git a/package.json b/package.json
index 53bb97cd..a9665437 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@balancer-labs/sor",
-    "version": "4.0.0-beta.5",
+    "version": "4.0.0-beta.6",
     "license": "GPL-3.0-only",
     "main": "dist/index.js",
     "module": "dist/index.esm.js",
diff --git a/src/pools/linearPool/linearPool.ts b/src/pools/linearPool/linearPool.ts
index 5dbec0eb..eca75c3a 100644
--- a/src/pools/linearPool/linearPool.ts
+++ b/src/pools/linearPool/linearPool.ts
@@ -761,7 +761,10 @@ export class LinearPool implements PoolBase {
         poolPairData: LinearPoolPairData,
         amount: OldBigNumber
     ): OldBigNumber {
-        const bigintAmount = parseFixed(amount.toString(), 18).toBigInt();
+        const bigintAmount = parseFixed(
+            amount.dp(18).toString(),
+            18
+        ).toBigInt();
         const mainBalance = poolPairData.mainBalanceScaled.toBigInt();
         const wrappedBalance = poolPairData.wrappedBalanceScaled.toBigInt();
         const bptSupply = poolPairData.virtualBptSupply.toBigInt();
@@ -835,7 +838,10 @@ export class LinearPool implements PoolBase {
         poolPairData: LinearPoolPairData,
         amount: OldBigNumber
     ): OldBigNumber {
-        const bigintAmount = parseFixed(amount.toString(), 18).toBigInt();
+        const bigintAmount = parseFixed(
+            amount.dp(18).toString(),
+            18
+        ).toBigInt();
         const mainBalance = poolPairData.mainBalanceScaled.toBigInt();
         const wrappedBalance = poolPairData.wrappedBalanceScaled.toBigInt();
         const bptSupply = poolPairData.virtualBptSupply.toBigInt();