On NixOS, timezone data is located at /etc/zoneinfo
diff --git a/Completion/Unix/Type/_time_zone b/Completion/Unix/Type/_time_zone
index cd924bbc7..5d683291b 100644
--- a/Completion/Unix/Type/_time_zone
+++ b/Completion/Unix/Type/_time_zone
@@ -3,7 +3,7 @@
 local expl
 
 if (( ! $+_zoneinfo_dirs )); then
-  _zoneinfo_dirs=( /usr/{share,lib,share/lib}/{zoneinfo*,locale/TZ}(/) )
+  _zoneinfo_dirs=( /etc/zoneinfo /usr/{share,lib,share/lib}/{zoneinfo*,locale/TZ}(/) )
 fi
 
 _wanted time-zones expl 'time zone' _files -W _zoneinfo_dirs "$@" -