diff --git a/apps/KhiCAS/src/main.cpp b/apps/KhiCAS/src/main.cpp
index 1ff6953c..6ca693c4 100644
--- a/apps/KhiCAS/src/main.cpp
+++ b/apps/KhiCAS/src/main.cpp
@@ -206,4 +206,9 @@ bool inexammode(){
   return extapp_inexammode();
 }
 
+//dummy function to avoid link error
+int __ssputws_r(void * _reent, const wchar_t * wstr, void * file) {
+    return 0; 
+} 
+
 } // end extern "C"