diff --git a/servatrice/src/servatrice_database_interface.cpp b/servatrice/src/servatrice_database_interface.cpp
index 6fa9dfa3..77f31156 100644
--- a/servatrice/src/servatrice_database_interface.cpp
+++ b/servatrice/src/servatrice_database_interface.cpp
@@ -98,7 +98,7 @@ bool Servatrice_DatabaseInterface::execSqlQuery(QSqlQuery *query)
 
 bool Servatrice_DatabaseInterface::usernameIsValid(const QString &user)
 {
-    static QRegExp re = QRegExp("[a-zA-Z0-9_\.-]+");
+    static QRegExp re = QRegExp("[a-zA-Z0-9_\\.-]+");
     return re.exactMatch(user);
 }