diff --git a/packages/zoe/src/contracts/scaledPriceAuthority.js b/packages/zoe/src/contracts/scaledPriceAuthority.js
index b558a315c16..2b43bff8fcf 100644
--- a/packages/zoe/src/contracts/scaledPriceAuthority.js
+++ b/packages/zoe/src/contracts/scaledPriceAuthority.js
@@ -52,7 +52,9 @@ export const prepare = async (zcf, privateArgs, baggage) => {
 
   const priceAuthority = makePriceAuthorityTransform({
     quoteMint,
-    sourcePriceAuthority,
+    // If the priceAuthority is overridden in privateArgs, use that version
+    sourcePriceAuthority:
+      privateArgs?.newPriceAuthority || sourcePriceAuthority,
     sourceBrandIn,
     sourceBrandOut,
     actualBrandIn,