diff --git a/library/server/wsf/router/wsf_file_system_handler.e b/library/server/wsf/router/wsf_file_system_handler.e
index fc2ba7ce..628115bf 100644
--- a/library/server/wsf/router/wsf_file_system_handler.e
+++ b/library/server/wsf/router/wsf_file_system_handler.e
@@ -204,7 +204,8 @@ feature -- Execution
 			if
 				attached req.meta_string_variable ("HTTP_IF_MODIFIED_SINCE") as s_if_modified_since and then
 				attached http_date_format_to_date (s_if_modified_since) as l_if_modified_since_date and then
-				attached file_date (f) as f_date and then (f_date >= l_if_modified_since_date)
+				attached file_date (f) as f_date and then
+				f_date <= l_if_modified_since_date
 			then
 				process_not_modified (f_date, req, res)
 			else