diff --git a/build/lib/mangle/index.js b/build/lib/mangle/index.js
index 8d509b9590d..75981c79d06 100644
--- a/build/lib/mangle/index.js
+++ b/build/lib/mangle/index.js
@@ -360,7 +360,7 @@ class Mangler {
         this.config = config;
         this.service = ts.createLanguageService(new staticLanguageServiceHost_1.StaticLanguageServiceHost(projectPath));
         this.renameWorkerPool = workerpool.pool(path.join(__dirname, 'renameWorker.js'), {
-            maxWorkers: 2,
+            maxWorkers: 1,
             minWorkers: 'max'
         });
     }
diff --git a/build/lib/mangle/index.ts b/build/lib/mangle/index.ts
index c0bfdc9e3ed..a87fe97f456 100644
--- a/build/lib/mangle/index.ts
+++ b/build/lib/mangle/index.ts
@@ -416,7 +416,7 @@ export class Mangler {
 		this.service = ts.createLanguageService(new StaticLanguageServiceHost(projectPath));
 
 		this.renameWorkerPool = workerpool.pool(path.join(__dirname, 'renameWorker.js'), {
-			maxWorkers: 2,
+			maxWorkers: 1,
 			minWorkers: 'max'
 		});
 	}