diff --git a/java/java.go b/java/java.go
index dbfad02..78cd362 100644
--- a/java/java.go
+++ b/java/java.go
@@ -1038,7 +1038,7 @@
 	case javaPlatform:
 		return "private API"
 	default:
-		panic(fmt.Errorf("unrecognized linktype: %v", lt))
+		panic(fmt.Errorf("unrecognized linktype: %d", lt))
 	}
 }