diff --git a/htdocs/langs/en_US/errors.lang b/htdocs/langs/en_US/errors.lang
index 8cbd8a5588b..b3eeae4606b 100644
--- a/htdocs/langs/en_US/errors.lang
+++ b/htdocs/langs/en_US/errors.lang
@@ -280,7 +280,7 @@ ErrorWrongFileName=Name of the file cannot have __SOMETHING__ in it
 ErrorNotInDictionaryPaymentConditions=Not in Payment Terms Dictionary, please modify.
 ErrorIsNotADraft=%s is not a draft
 ErrorExecIdFailed=Can't execute command "id"
-ErrorBadCharIntoLoginName=Unauthorized character in the login name
+ErrorBadCharIntoLoginName=Unauthorized character in the field %s
 ErrorRequestTooLarge=Error, request too large or session expired
 ErrorNotApproverForHoliday=You are not the approver for leave %s
 ErrorAttributeIsUsedIntoProduct=This attribute is used in one or more product variants
diff --git a/htdocs/user/class/user.class.php b/htdocs/user/class/user.class.php
index d49f810f915..75c9f1b2bae 100644
--- a/htdocs/user/class/user.class.php
+++ b/htdocs/user/class/user.class.php
@@ -1522,7 +1522,7 @@ class User extends CommonObject
 			return -1;
 		} elseif (preg_match('/['.preg_quote($badCharUnauthorizedIntoLoginName, '/').']/', $this->login)) {
 			$langs->load("errors");
-			$this->error = $langs->trans("ErrorBadCharIntoLoginName");
+			$this->error = $langs->trans("ErrorBadCharIntoLoginName", $langs->transnoentitiesnoconv("Login"));
 			return -1;
 		}
 
@@ -1918,7 +1918,7 @@ class User extends CommonObject
 			return -1;
 		} elseif (preg_match('/['.preg_quote($badCharUnauthorizedIntoLoginName, '/').']/', $this->login)) {
 			$langs->load("errors");
-			$this->error = $langs->trans("ErrorBadCharIntoLoginName");
+			$this->error = $langs->trans("ErrorBadCharIntoLoginName", $langs->transnoentitiesnoconv("Login"));
 			return -1;
 		}