diff --git a/weed/filer2/reader_at.go b/weed/filer2/reader_at.go
index b9913d2ca..448aa3465 100644
--- a/weed/filer2/reader_at.go
+++ b/weed/filer2/reader_at.go
@@ -9,8 +9,8 @@ import (
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
-	"github.com/chrislusf/seaweedfs/weed/pb/pb_cache"
 	"github.com/chrislusf/seaweedfs/weed/util"
+	"github.com/chrislusf/seaweedfs/weed/util/pb_cache"
 	"github.com/chrislusf/seaweedfs/weed/wdclient"
 )
 
diff --git a/weed/filesys/wfs.go b/weed/filesys/wfs.go
index 191b79845..5e994d14e 100644
--- a/weed/filesys/wfs.go
+++ b/weed/filesys/wfs.go
@@ -15,8 +15,8 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
-	"github.com/chrislusf/seaweedfs/weed/pb/pb_cache"
 	"github.com/chrislusf/seaweedfs/weed/util"
+	"github.com/chrislusf/seaweedfs/weed/util/pb_cache"
 	"github.com/seaweedfs/fuse"
 	"github.com/seaweedfs/fuse/fs"
 )
diff --git a/weed/server/webdav_server.go b/weed/server/webdav_server.go
index f4f3b44db..5a9861fe7 100644
--- a/weed/server/webdav_server.go
+++ b/weed/server/webdav_server.go
@@ -16,8 +16,8 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
-	"github.com/chrislusf/seaweedfs/weed/pb/pb_cache"
 	"github.com/chrislusf/seaweedfs/weed/util"
+	"github.com/chrislusf/seaweedfs/weed/util/pb_cache"
 
 	"github.com/chrislusf/seaweedfs/weed/filer2"
 	"github.com/chrislusf/seaweedfs/weed/glog"
diff --git a/weed/pb/pb_cache/chunk_cache.go b/weed/util/pb_cache/chunk_cache.go
similarity index 100%
rename from weed/pb/pb_cache/chunk_cache.go
rename to weed/util/pb_cache/chunk_cache.go