diff --git a/completions/cppcheck b/completions/cppcheck
index dc321398..465f40d2 100644
--- a/completions/cppcheck
+++ b/completions/cppcheck
@@ -28,7 +28,7 @@ _cppcheck()
             return
             ;;
         -j)
-            COMPREPLY=( $( compgen -W '{2..16}' -- "$cur" ) )
+            COMPREPLY=( $( compgen -W "{2..$(_ncpus)}" -- "$cur" ) )
             return
             ;;
         --std)