diff --git a/parallel/map.go b/parallel/map.go
index 33e5509..1d8cbaa 100644
--- a/parallel/map.go
+++ b/parallel/map.go
@@ -27,7 +27,7 @@ func MapV[T, V any](xs []T, fx func(T) V) []V {
 	tmp := make([][]V, len(spl))
 	for i, v := range spl {
 		go func(ix int, vx []T) {
-			spl[ix] = lambda.MapV(vx, fx)
+			tmp[ix] = lambda.MapV(vx, fx)
 			wg.Done()
 		}(i, v)
 	}