diff --git a/dashboard/builder/main.go b/dashboard/builder/main.go
index da912b47..d3daddec 100644
--- a/dashboard/builder/main.go
+++ b/dashboard/builder/main.go
@@ -349,7 +349,7 @@ func (b *Builder) buildOrBench() bool {
 		}
 		return true
 	default:
-		log.Println("Unknown todo kind %v", kind)
+		log.Printf("Unknown todo kind %v", kind)
 		return false
 	}
 }