diff --git a/package.json b/package.json
index 74b2a0f4..6ce541bf 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@balancer-labs/sor",
-    "version": "4.1.1-beta.5",
+    "version": "4.1.1-beta.6",
     "license": "GPL-3.0-only",
     "main": "dist/index.js",
     "module": "dist/index.esm.js",
diff --git a/src/pools/linearPool/linearMath.ts b/src/pools/linearPool/linearMath.ts
index 234f8ed3..df6bbbf9 100644
--- a/src/pools/linearPool/linearMath.ts
+++ b/src/pools/linearPool/linearMath.ts
@@ -1,4 +1,4 @@
-import { MathSol } from '../../utils/basicOperations';
+import { MathSol, BZERO } from '../../utils/basicOperations';
 
 type Params = {
     fee: bigint;
@@ -395,7 +395,7 @@ export function _calcTokensOutGivenExactBptIn(
     // multiplication and division.
 
     const bptRatio = MathSol.divDownFixed(bptAmountIn, bptTotalSupply);
-    const amountsOut: bigint[] = new Array(balances.length);
+    const amountsOut: bigint[] = new Array(balances.length).fill(BZERO);
     for (let i = 0; i < balances.length; i++) {
         // BPT is skipped as those tokens are not the LPs, but rather the preminted and undistributed amount.
         if (i != bptIndex) {