diff --git a/sql/mysql_priv.h b/sql/mysql_priv.h
index 762c854d180..d73b1f1aac0 100644
--- a/sql/mysql_priv.h
+++ b/sql/mysql_priv.h
@@ -566,7 +566,8 @@ void get_default_definer(THD *thd, LEX_USER *definer);
 LEX_USER *create_default_definer(THD *thd);
 LEX_USER *create_definer(THD *thd, LEX_STRING *user_name, LEX_STRING *host_name);
 LEX_USER *get_current_user(THD *thd, LEX_USER *user);
-bool check_string_length(LEX_STRING *str, const char *err_msg, uint max_length);
+bool check_string_length(CHARSET_INFO *cs, LEX_STRING *str,
+                         const char *err_msg, uint max_length);
 
 enum enum_mysql_completiontype {
   ROLLBACK_RELEASE=-2, ROLLBACK=1,  ROLLBACK_AND_CHAIN=7,
diff --git a/sql/slave.h b/sql/slave.h
index c355f7172a9..dee134aaa0c 100644
--- a/sql/slave.h
+++ b/sql/slave.h
@@ -406,7 +406,7 @@ typedef struct st_master_info
   /* the variables below are needed because we can change masters on the fly */
   char master_log_name[FN_REFLEN];
   char host[HOSTNAME_LENGTH+1];
-  char user[USERNAME_LENGTH+1];
+  char user[USERNAME_BYTE_LENGTH+1];
   char password[MAX_PASSWORD_LENGTH+1];
   my_bool ssl; // enables use of SSL connection if true
   char ssl_ca[FN_REFLEN], ssl_capath[FN_REFLEN], ssl_cert[FN_REFLEN];
diff --git a/sql/sql_parse.cc b/sql/sql_parse.cc
index a88eac84865..e2c147e4cf7 100644
--- a/sql/sql_parse.cc
+++ b/sql/sql_parse.cc
@@ -7552,6 +7552,7 @@ LEX_USER *get_current_user(THD *thd, LEX_USER *user)
 
   SYNOPSIS
     check_string_length()
+      cs          string charset
       str         string to be checked
       err_msg     error message to be displayed if the string is too long
       max_length  max length
@@ -7561,16 +7562,13 @@ LEX_USER *get_current_user(THD *thd, LEX_USER *user)
     TRUE    the passed string is longer than max_length
 */
 
-bool check_string_length(LEX_STRING *str, const char *err_msg,
-                         uint max_length)
+bool check_string_length(CHARSET_INFO *cs, LEX_STRING *str,
+                         const char *err_msg, uint max_length)
 {
-
-  if (system_charset_info->cset->charpos(system_charset_info, str->str,
-                                         str->str + str->length, max_length) >=
-      str->length)
-    return FALSE;
+  if (cs->cset->charpos(cs, str->str, str->str + str->length,
+                        max_length) >= str->length)
+    return FALSE; 
 
   my_error(ER_WRONG_STRING_LENGTH, MYF(0), str->str, err_msg, max_length);
-
   return TRUE;
 }
diff --git a/sql/sql_yacc.yy b/sql/sql_yacc.yy
index f98e4a708da..30c7da220a6 100644
--- a/sql/sql_yacc.yy
+++ b/sql/sql_yacc.yy
@@ -7507,7 +7507,8 @@ user:
 	  $$->host.str= (char *) "%";
 	  $$->host.length= 1;
 
-	  if (check_string_length(&$$->user, ER(ER_USERNAME), USERNAME_LENGTH))
+	  if (check_string_length(system_charset_info, &$$->user,
+                                  ER(ER_USERNAME), USERNAME_LENGTH))
 	    YYABORT;
 	}
 	| ident_or_text '@' ident_or_text
@@ -7517,9 +7518,10 @@ user:
 	      YYABORT;
 	    $$->user = $1; $$->host=$3;
 
-	    if (check_string_length(&$$->user, ER(ER_USERNAME), USERNAME_LENGTH) ||
-	        check_string_length(&$$->host, ER(ER_HOSTNAME),
-					       HOSTNAME_LENGTH))
+	    if (check_string_length(system_charset_info, &$$->user,
+                                    ER(ER_USERNAME), USERNAME_LENGTH) ||
+	        check_string_length(&my_charset_latin1, &$$->host,
+                                    ER(ER_HOSTNAME), HOSTNAME_LENGTH))
 	      YYABORT;
 	  }
 	| CURRENT_USER optional_braces