diff --git a/packages/engine/paima-rest/src/EngineService.ts b/packages/engine/paima-rest/src/EngineService.ts
index 735ca32d..2712049f 100644
--- a/packages/engine/paima-rest/src/EngineService.ts
+++ b/packages/engine/paima-rest/src/EngineService.ts
@@ -14,7 +14,7 @@ export class EngineService {
     this.achievements = alike.achievements;
   }
 
-  getSM = () => this.stateMachine;
+  getSM = (): GameStateMachine => this.stateMachine;
 
   // Singleton
   private static _instance?: EngineService;
diff --git a/packages/engine/paima-rest/src/controllers/AchievementsController.ts b/packages/engine/paima-rest/src/controllers/AchievementsController.ts
index ad49a042..89265956 100644
--- a/packages/engine/paima-rest/src/controllers/AchievementsController.ts
+++ b/packages/engine/paima-rest/src/controllers/AchievementsController.ts
@@ -66,7 +66,7 @@ export class AchievementsController extends Controller {
     const meta = await this.meta();
     const filtered = meta.list
       .filter(ach => category === undefined || category === ach.category)
-      .filter(ach => isActive === null || isActive === ach.isActive);
+      .filter(ach => isActive === undefined || isActive === ach.isActive);
 
     this.setHeader('Content-Language', acceptLanguages[0]);
     return {
diff --git a/packages/engine/paima-standalone/src/utils/import.ts b/packages/engine/paima-standalone/src/utils/import.ts
index f379f961..977bf27c 100644
--- a/packages/engine/paima-standalone/src/utils/import.ts
+++ b/packages/engine/paima-standalone/src/utils/import.ts
@@ -20,7 +20,7 @@ export function checkForPackedGameCode(): boolean {
 function importFile<T>(path: string): T {
   // dynamic import cannot be used here due to PKG limitations
   // eslint-disable-next-line @typescript-eslint/no-var-requires
-  return require(`${process.cwd}/${path}`);
+  return require(`${process.cwd()}/${path}`);
 }
 
 export interface GameCodeImport {