diff --git a/types/timespan.pp b/types/timespan.pp
index 972e6d95..34f0eebf 100644
--- a/types/timespan.pp
+++ b/types/timespan.pp
@@ -2,5 +2,5 @@
 # @see https://www.freedesktop.org/software/systemd/man/latest/systemd.time.html
 type Systemd::Timespan = Variant[
   Integer[0],
-  Pattern[/^([0-9]+ *(usec|us|msec|ms|second[s]?|sec|s|minute[s]?|min|m|hour[s]?|hr|h|day[s]?|d|week[s]?|w|month[s]?|M|year[s]?|y)? *)+$/]
+  Pattern[/^([0-9]+ *(usec|us|msec|ms|seconds?|sec|s|minutes?|min|m|hours?|hr|h|days?|d|weeks?|w|months?|M|years?|y)? *)+$/]
 ]