diff --git a/src/shared/project-host-setup-projection.ts b/src/shared/project-host-setup-projection.ts
index 84d6ce6a000..653d47df9a7 100644
--- a/src/shared/project-host-setup-projection.ts
+++ b/src/shared/project-host-setup-projection.ts
@@ -298,7 +298,7 @@ export function projectHostSetupProjectionFromRepos(
 export function getProjectHostSetupsForProject(
   setups: readonly ProjectHostSetup[],
   projectId: string
-): ProjectHostSetup[] {
+): readonly ProjectHostSetup[] {
   return setups.filter((setup) => setup.projectId === projectId)
 }