diff --git a/chat/public/builder.js b/chat/public/builder.js
index a5dc83e..8c9400c 100644
--- a/chat/public/builder.js
+++ b/chat/public/builder.js
@@ -360,7 +360,9 @@ async function redoMessage(msg, session) {
     }
 
     if (planContent) {
-      await redoProceedWithBuild(planContent, msg.model);
+      // Use null to force redoProceedWithBuild to use the currently selected model
+      // instead of the original message's model
+      await redoProceedWithBuild(planContent, null);
     } else {
       setStatus('Cannot redo: plan content not available');
     }