diff --git a/.changeset/rotten-seas-serve.md b/.changeset/rotten-seas-serve.md
new file mode 100644
index 00000000..13539b02
--- /dev/null
+++ b/.changeset/rotten-seas-serve.md
@@ -0,0 +1,5 @@
+---
+"outstatic": patch
+---
+
+fix: undefined process.env.OST_REPO_OWNER
diff --git a/packages/outstatic/src/client/pages/collections.tsx b/packages/outstatic/src/client/pages/collections.tsx
index 03e0305f..94474c58 100644
--- a/packages/outstatic/src/client/pages/collections.tsx
+++ b/packages/outstatic/src/client/pages/collections.tsx
@@ -9,6 +9,7 @@ import useOid from '../../utils/hooks/useOid'
 
 export default function Collections() {
   const {
+    repoOwner,
     collections,
     session,
     repoSlug,
@@ -26,7 +27,7 @@ export default function Collections() {
   const deleteCollection = async (collection: string) => {
     try {
       const oid = await fetchOid()
-      const owner = process.env.OST_REPO_OWNER || session?.user?.login || ''
+      const owner = repoOwner || session?.user?.login || ''
 
       const commitInput = collectionCommitInput({
         owner,