diff --git a/src/appdistribution/client.ts b/src/appdistribution/client.ts
index 76bc0f2ff9d..2e33f868cd0 100644
--- a/src/appdistribution/client.ts
+++ b/src/appdistribution/client.ts
@@ -92,7 +92,7 @@ export class AppDistributionClient {
       method: "POST",
       path: `/upload/v1/${appName}/releases:upload`,
       headers: {
-        "X-Goog-Upload-File-Name": distribution.getFileName(),
+        "X-Goog-Upload-File-Name": encodeURIComponent(distribution.getFileName()),
         "X-Goog-Upload-Protocol": "raw",
         "Content-Type": "application/octet-stream",
       },