diff --git a/roaring/roaring_test.go b/roaring/roaring_test.go
index c6f7b9693..b165042a9 100644
--- a/roaring/roaring_test.go
+++ b/roaring/roaring_test.go
@@ -46,7 +46,7 @@ func TestSize(t *testing.T) {
 
 	//bitmap
 	b := roaring.NewFileBitmap()
-	for i := uint64(0); i < 4096; i++ {
+	for i := uint64(0); i <= 4096; i++ {
 		b.DirectAdd(i)
 	}