diff --git a/pkg/storage/fs/owncloud/owncloud.go b/pkg/storage/fs/owncloud/owncloud.go
index 6b3a2407d6..54493c88d5 100644
--- a/pkg/storage/fs/owncloud/owncloud.go
+++ b/pkg/storage/fs/owncloud/owncloud.go
@@ -20,8 +20,6 @@ package owncloud
 
 import (
 	"context"
-	"crypto/md5"
-	"encoding/binary"
 	"encoding/csv"
 	"fmt"
 	"io"
@@ -31,7 +29,6 @@ import (
 	"path/filepath"
 	"strconv"
 	"strings"
-	"syscall"
 	"time"
 
 	storageproviderv0alphapb "github.com/cs3org/go-cs3apis/cs3/storageprovider/v0alpha"
@@ -333,38 +330,6 @@ func (fs *ocFS) removeNamespace(ctx context.Context, np string) string {
 	}
 }
 
-// calcEtag will create an etag based on the md5 of
-// - mtime,
-// - inode (if available),
-// - device (if available) and
-// - size.
-// errors are logged, but an etag will still be returned
-func calcEtag(ctx context.Context, fi os.FileInfo) string {
-	log := appctx.GetLogger(ctx)
-	h := md5.New()
-	err := binary.Write(h, binary.BigEndian, fi.ModTime().Unix())
-	if err != nil {
-		log.Error().Err(err).Msg("error writing mtime")
-	}
-	stat, ok := fi.Sys().(*syscall.Stat_t)
-	if ok {
-		// take device and inode into account
-		err = binary.Write(h, binary.BigEndian, stat.Ino)
-		if err != nil {
-			log.Error().Err(err).Msg("error writing inode")
-		}
-		err = binary.Write(h, binary.BigEndian, stat.Dev)
-		if err != nil {
-			log.Error().Err(err).Msg("error writing device")
-		}
-	}
-	err = binary.Write(h, binary.BigEndian, fi.Size())
-	if err != nil {
-		log.Error().Err(err).Msg("error writing size")
-	}
-	return fmt.Sprintf(`"%x"`, h.Sum(nil))
-}
-
 func getOwner(fn string) string {
 	parts := strings.SplitN(fn, "/", 3)
 	// parts = "", "<username>", "files", "foo/bar.txt"
diff --git a/pkg/storage/fs/owncloud/owncloud_unix.go b/pkg/storage/fs/owncloud/owncloud_unix.go
new file mode 100755
index 0000000000..5258444bc5
--- /dev/null
+++ b/pkg/storage/fs/owncloud/owncloud_unix.go
@@ -0,0 +1,64 @@
+// Copyright 2018-2019 CERN
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// In applying this license, CERN does not waive the privileges and immunities
+// granted to it by virtue of its status as an Intergovernmental Organization
+// or submit itself to any jurisdiction.
+
+// +build !windows
+
+package owncloud
+
+import (
+	"context"
+	"crypto/md5"
+	"encoding/binary"
+	"fmt"
+	"os"
+	"syscall"
+
+	"github.com/cs3org/reva/pkg/appctx"
+)
+
+// calcEtag will create an etag based on the md5 of
+// - mtime,
+// - inode (if available),
+// - device (if available) and
+// - size.
+// errors are logged, but an etag will still be returned
+func calcEtag(ctx context.Context, fi os.FileInfo) string {
+	log := appctx.GetLogger(ctx)
+	h := md5.New()
+	err := binary.Write(h, binary.BigEndian, fi.ModTime().Unix())
+	if err != nil {
+		log.Error().Err(err).Msg("error writing mtime")
+	}
+	stat, ok := fi.Sys().(*syscall.Stat_t)
+	if ok {
+		// take device and inode into account
+		err = binary.Write(h, binary.BigEndian, stat.Ino)
+		if err != nil {
+			log.Error().Err(err).Msg("error writing inode")
+		}
+		err = binary.Write(h, binary.BigEndian, stat.Dev)
+		if err != nil {
+			log.Error().Err(err).Msg("error writing device")
+		}
+	}
+	err = binary.Write(h, binary.BigEndian, fi.Size())
+	if err != nil {
+		log.Error().Err(err).Msg("error writing size")
+	}
+	return fmt.Sprintf(`"%x"`, h.Sum(nil))
+}
diff --git a/pkg/storage/fs/owncloud/owncloud_windows.go b/pkg/storage/fs/owncloud/owncloud_windows.go
new file mode 100644
index 0000000000..8e9a7d4d71
--- /dev/null
+++ b/pkg/storage/fs/owncloud/owncloud_windows.go
@@ -0,0 +1,52 @@
+// Copyright 2018-2019 CERN
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// In applying this license, CERN does not waive the privileges and immunities
+// granted to it by virtue of its status as an Intergovernmental Organization
+// or submit itself to any jurisdiction.
+
+// +build windows
+
+package owncloud
+
+import (
+	"context"
+	"crypto/md5"
+	"encoding/binary"
+	"fmt"
+	"os"
+
+	"github.com/cs3org/reva/pkg/appctx"
+)
+
+// calcEtag will create an etag based on the md5 of
+// - mtime,
+// - inode (if available),
+// - device (if available) and
+// - size.
+// errors are logged, but an etag will still be returned
+func calcEtag(ctx context.Context, fi os.FileInfo) string {
+	log := appctx.GetLogger(ctx)
+	h := md5.New()
+	err := binary.Write(h, binary.BigEndian, fi.ModTime().Unix())
+	if err != nil {
+		log.Error().Err(err).Msg("error writing mtime")
+	}
+	// device and inode have no meaning on windows
+	err = binary.Write(h, binary.BigEndian, fi.Size())
+	if err != nil {
+		log.Error().Err(err).Msg("error writing size")
+	}
+	return fmt.Sprintf(`"%x"`, h.Sum(nil))
+}