diff --git a/output/build.go b/output/build.go
index 6eb08a4..f8519bc 100644
--- a/output/build.go
+++ b/output/build.go
@@ -181,7 +181,7 @@ func BuildHandler(w http.ResponseWriter, r *http.Request) {
 			}
 
 			if nil != err {
-				logger.Warn(err)
+				logger.Warnf("%#v", err)
 
 				break
 			}