diff --git a/templates/file_age.ini b/templates/file_age.ini
index 617c644..228317e 100644
--- a/templates/file_age.ini
+++ b/templates/file_age.ini
@@ -8,7 +8,7 @@ value = "$service_name_template$.perfdata.age.value"
 areaAlpha = "0.5"
 areaMode = "all"
 min = "0"
-yUnitSystem = "none"
+yUnitSystem = "sec"
 
 [file_age-age.functions]
 value = "alias(color($metric$, '#1a7dd7'), 'File age (s)')"