diff --git a/data.go b/data.go
index 336069d..c2e5065 100644
--- a/data.go
+++ b/data.go
@@ -98,7 +98,7 @@ func (d *Data) getProject() {
 	e = json.NewDecoder(r.Body).Decode(&p)
 
 	if len(p.Projects) < 1 {
-		e = fmt.Errorf("no project found with id", d.projectId)
+		e = fmt.Errorf("no project found with id %d", d.projectId)
 	} else {
 		// filter out obsolete versions
 		project = p.Projects[0]