diff --git a/homework/password-check/validation.hpp b/homework/password-check/validation.hpp
index 09e23ada..1af601e6 100644
--- a/homework/password-check/validation.hpp
+++ b/homework/password-check/validation.hpp
@@ -1,5 +1,5 @@
 #pragma once
-
+#include <string>
 enum ErrorCode
 {
     Ok,
@@ -9,7 +9,7 @@ enum ErrorCode
     PasswordNeedsAtLeastOneUppercaseLetter,
     PasswordsDoNotMatch,
 };
-std::string getErrorMessage(ErrorCode result);
+string getErrorMessage(ErrorCode result);
 bool doPasswordsMatch(std::string password_1, std::string password_2);
 ErrorCode checkPasswordRules(std::string password);
 ErrorCode checkPassword(std::string password_1, std::string password_2);