diff --git a/ana/prediction_test.go b/ana/prediction_test.go
index 777e6db..3921449 100644
--- a/ana/prediction_test.go
+++ b/ana/prediction_test.go
@@ -32,7 +32,7 @@ func TestPredictionPredict(t *testing.T) {
 	}
 	from := time.Now()
 	these := []time.Time{time.Now().Add(time.Hour * 24 * 365 / 12)}
-	theseK := these.Format("2006-01")
+	theseK := these[0].Format("2006-01")
 	_, _ = inc, double
 
 	cases := map[string]struct {
@@ -41,7 +41,7 @@ func TestPredictionPredict(t *testing.T) {
 		want       ledger.Register
 	}{
 		"empty": {
-			want: ledger.Balances{theseK: {}},
+			want: ledger.Register{theseK: {}},
 		},
 	}