diff --git a/sparkline.go b/sparkline.go
index e0725d5..c63a585 100644
--- a/sparkline.go
+++ b/sparkline.go
@@ -106,7 +106,7 @@ func (sl *Sparklines) Buffer() []Point {
 		data := l.Data
 
 		if len(data) > sl.innerWidth {
-			data = data[:sl.innerWidth]
+			data = data[len(data)-sl.innerWidth:]
 		}
 
 		if l.Title != "" {