diff --git a/plugins/check_gentoo_portage b/plugins/check_gentoo_portage
index 23450e3..5985eec 100755
--- a/plugins/check_gentoo_portage
+++ b/plugins/check_gentoo_portage
@@ -323,7 +323,7 @@ class PortageTester(object):
         portage_age = (now - portage_tree_time)/3600.0
         self.vprint(2, "portage tree is %.1f hours old" % portage_age)
         if portage_age > self.max_portage_tree_age:
-            end(CRITICAL, "Portage tree is %.1f hours out of date, " \
+            end(WARNING, "Portage tree is %.1f hours out of date, " \
                                                                    % portage_age \
                         + "security package information is not reliable")
         elif portage_age < 0: