diff --git a/src/mf.proto b/src/mf.proto
index 470055c..73ac1ab 100644
--- a/src/mf.proto
+++ b/src/mf.proto
@@ -2,7 +2,10 @@ syntax = "proto3";
 
 option go_package = "git.eeqj.de/sneak/mfer";
 
-import "google/protobuf/timestamp.proto";
+message Timestamp {
+  int64 seconds = 1;
+  int32 nanos = 2;
+}
 
 message MFFile {
     enum Version {
@@ -40,9 +43,9 @@ message MFFilePath {
 
     // optional per-file metadata
     string mimeType = 301;
-    google.protobuf.Timestamp mtime = 302;
-    google.protobuf.Timestamp ctime = 303;
-    google.protobuf.Timestamp atime = 304;
+    Timestamp mtime = 302;
+    Timestamp ctime = 303;
+    Timestamp atime = 304;
 
 }
 
@@ -64,6 +67,6 @@ message MFFileInner {
     repeated MFFilePath files = 103;
 
     // optional manifest attributes 2xx:
-    google.protobuf.Timestamp createdAt = 201;
+    Timestamp createdAt = 201;
 }