diff --git a/lib/app.js b/lib/app.js
index 03c92ca..ef85a90 100644
--- a/lib/app.js
+++ b/lib/app.js
@@ -87,7 +87,14 @@ class Mali extends Emitter {
       if (typeof path === 'object' && path.root && path.file) {
         protoFilePath = path.file
         if (!loadOptions.includeDirs) {
-          loadOptions.includeDirs = [path.root]
+          /**
+           * To support multiple folders to feed the protoLoader.
+           */
+          if (path.root instanceof Array) {
+            loadOptions.includeDirs = path.root
+          } else {
+            loadOptions.includeDirs = [path.root]
+          }
         }
       }