diff --git a/packages/boot/src/booters/base-artifact.booter.ts b/packages/boot/src/booters/base-artifact.booter.ts
index 88e535ad43ee..c3331a43656b 100644
--- a/packages/boot/src/booters/base-artifact.booter.ts
+++ b/packages/boot/src/booters/base-artifact.booter.ts
@@ -91,12 +91,12 @@ export class BaseArtifactBooter implements Booter {
         : [this.options.extensions]
       : [];
 
-    const joinedDirs = this.dirs.join('|');
+    const joinedDirs = this.dirs.join(',');
     const joinedExts = this.extensions.join('|');
 
     this.glob = this.options.glob
       ? this.options.glob
-      : `/@(${joinedDirs})/${
+      : `/{${joinedDirs}}/${
           this.options.nested ? '**/*' : '*'
         }@(${joinedExts})`;
   }