diff --git a/.changeset/proud-terms-swim.md b/.changeset/proud-terms-swim.md
new file mode 100644
index 00000000..9d20b0ad
--- /dev/null
+++ b/.changeset/proud-terms-swim.md
@@ -0,0 +1,5 @@
+---
+"@tus/gcs-store": patch
+---
+
+Correctly pass the content type from upload.metadata to GCS.
diff --git a/packages/gcs-store/src/index.ts b/packages/gcs-store/src/index.ts
index b14f48c7..f38c6319 100644
--- a/packages/gcs-store/src/index.ts
+++ b/packages/gcs-store/src/index.ts
@@ -1,4 +1,4 @@
-import type {Bucket} from '@google-cloud/storage'
+import type {Bucket, CreateWriteStreamOptions} from '@google-cloud/storage'
 import stream from 'node:stream'
 import type http from 'node:http'
 import debug from 'debug'
@@ -35,7 +35,7 @@ export class GCSStore extends DataStore {
 
       file.storage = {type: 'gcs', path: file.id, bucket: this.bucket.name}
 
-      const options = {
+      const options: CreateWriteStreamOptions = {
         metadata: {
           metadata: {
             tus_version: TUS_RESUMABLE,
@@ -43,6 +43,9 @@ export class GCSStore extends DataStore {
           },
         },
       }
+      if (file.metadata?.contentType) {
+        options.contentType = file.metadata.contentType
+      }
       const fake_stream = new stream.PassThrough()
       fake_stream.end()
       fake_stream