diff --git a/lib/Doctrine/ORM/Query/AST/Functions/DateSubFunction.php b/lib/Doctrine/ORM/Query/AST/Functions/DateSubFunction.php
index bcd994ba9..d0e890fa7 100644
--- a/lib/Doctrine/ORM/Query/AST/Functions/DateSubFunction.php
+++ b/lib/Doctrine/ORM/Query/AST/Functions/DateSubFunction.php
@@ -58,7 +58,7 @@ class DateSubFunction extends DateAddFunction
 
             default:
                 throw QueryException::semanticalError(
-                    'DATE_SUB() only supports units of type day and month.'
+                    'DATE_SUB() only supports units of type hour, day and month.'
                 );
         }
     }