diff --git a/lib/workers/api_group.js b/lib/workers/api_group.js
index 6a55b71..0b046c3 100644
--- a/lib/workers/api_group.js
+++ b/lib/workers/api_group.js
@@ -80,7 +80,7 @@ function postProcess(parsedFiles, filenames, preProcess, packageInfos, source, t
                 }
 
                 // replace special chars
-                group = group.replace(/[^\w]/g, '_');
+                group = group.replace(/[^\w\u3130-\u318F\uAC00-\uD7AF]/g, '_');
 
                 block.local[target] = group;
             }