diff --git a/completions/xz b/completions/xz
index e2e1b709..f30551c9 100644
--- a/completions/xz
+++ b/completions/xz
@@ -23,6 +23,10 @@ _xz()
             COMPREPLY=( $( compgen -W 'auto xz lzma raw' -- "$cur" ) )
             return 0
             ;;
+        -T|--threads)
+            COMPREPLY=( $( compgen -W "{0..$(_ncpus)}" -- "$cur" ) )
+            return 0
+            ;;
         -M|--memlimit|--memlimit-compress|--memlimit-decompress|--memory|\
         -S|--suffix|--delta|--lzma1|--lzma2)
             # argument required but no completions available