diff --git a/include/toolkit.h b/include/toolkit.h
index 1009322..e80a156 100644
--- a/include/toolkit.h
+++ b/include/toolkit.h
@@ -55,7 +55,7 @@ namespace toolkit{
         }
         size_t len = 0;
         while(true){
-            auto pos = result.find_first_of(d);
+            auto pos = result.find(d);
             if(pos == std::string::npos){
                 return result;
             }