diff --git a/http/query.go b/http/query.go
index c184c7c6ff..bc1dd8c061 100644
--- a/http/query.go
+++ b/http/query.go
@@ -117,7 +117,7 @@ func toSpec(p *ast.Program, now func() time.Time) (*flux.Spec, error) {
 		return nil, err
 	}
 
-	if err := itrp.Eval(semProg); err != nil {
+	if err := itrp.Eval(semProg, nil); err != nil {
 		return nil, err
 	}
 	return flux.ToSpec(itrp, itrp.SideEffects()...), nil