diff --git a/arena/arena.go b/arena/arena.go
index 3bcc728..a842390 100644
--- a/arena/arena.go
+++ b/arena/arena.go
@@ -29,6 +29,10 @@ func MakeSlice[T any](arena Arena, len, cap int) []T {
 		panic(err)
 	}
 
+	if len == -1 {
+		len = cap
+	}
+
 	return unsafe.Slice((*T)(ptr), cap)[:len]
 }
 
diff --git a/arena/arenas.go b/arena/arenas.go
index 2bc362f..e82fca6 100644
--- a/arena/arenas.go
+++ b/arena/arenas.go
@@ -211,7 +211,7 @@ func Paged(page_size, total_reserved_in_bytes uintptr) Arena {
 				required := offset + aligned
 				to_commit := mem.AlignForward(required, page_size)
 
-				if err := mem.Commit(base[committed:to_commit-committed], mem.AccessRead|mem.AccessWrite); err != nil {
+				if err := mem.Commit(base[committed:to_commit], mem.AccessRead|mem.AccessWrite); err != nil {
 					return nil, fmt.Errorf("paged: failed to commit memory - %w", err)
 				}