diff --git a/annotation_series_test.go b/annotation_series_test.go
index 4437f82..8945836 100644
--- a/annotation_series_test.go
+++ b/annotation_series_test.go
@@ -55,7 +55,7 @@ func TestAnnotationSeriesMeasure(t *testing.T) {
 	assert.False(box.IsZero())
 	assert.Equal(-5.0, box.Top)
 	assert.Equal(5.0, box.Left)
-	assert.Equal(147.0, box.Right) //the top,left annotation sticks up 5px and out ~44px.
+	assert.Equal(146.0, box.Right) //the top,left annotation sticks up 5px and out ~44px.
 	assert.Equal(115.0, box.Bottom)
 }