diff --git a/expr_test.go b/expr_test.go
index 516bba4..da758fc 100644
--- a/expr_test.go
+++ b/expr_test.go
@@ -18,7 +18,7 @@ func TestExpr(t *testing.T) {
 	}
 
 	inputs := []inputType{
-		/*   1 */ {`fact=func(n){(n)?{1}::{fact(n-1)}}; fact(2)`, int64(2), nil},
+		/*   1 */ {`fact=func(n){(n)?{1}::{n*fact(n-1)}}; fact(5)`, int64(120), nil},
 	}
 
 	succeeded := 0