diff --git a/src/p4/PackagerOptions.svelte b/src/p4/PackagerOptions.svelte
index 9259d9c3..844d8993 100644
--- a/src/p4/PackagerOptions.svelte
+++ b/src/p4/PackagerOptions.svelte
@@ -43,6 +43,12 @@
   defaultOptions.extensions = projectData.project.analysis.extensions;
   const options = writablePersistentStore(`PackagerOptions.${projectData.uniqueId}`, defaultOptions);
 
+  // Compatibility with https://github.com/TurboWarp/packager/commit/f66199abd1c896c11aa69247275a1594fdfc95b8
+  $options.extensions = $options.extensions.map(i => {
+    if (typeof i === 'object' && i) return i.url || '';
+    return i;
+  });
+
   const hasMagicComment = (magic) => projectData.project.analysis.stageComments.find(
     (text) => text.split('\n').find((line) => line.endsWith(magic))
   );