diff --git a/cmd/fs-v1-helpers.go b/cmd/fs-v1-helpers.go
index a275c08b6..79e27418e 100644
--- a/cmd/fs-v1-helpers.go
+++ b/cmd/fs-v1-helpers.go
@@ -321,7 +321,7 @@ func fsCreateFile(ctx context.Context, filePath string, reader io.Reader, buf []
 		return 0, err
 	}
 
-	writer, err := lock.Open(filePath, os.O_CREATE|os.O_WRONLY, 0666)
+	writer, err := lock.Open(filePath, os.O_CREATE|os.O_WRONLY|os.O_SYNC, 0666)
 	if err != nil {
 		return 0, osErrToFSFileErr(err)
 	}
diff --git a/pkg/ioutil/append-file_nix.go b/pkg/ioutil/append-file_nix.go
index f82367a9f..a5b937fc6 100644
--- a/pkg/ioutil/append-file_nix.go
+++ b/pkg/ioutil/append-file_nix.go
@@ -25,7 +25,7 @@ import (
 
 // AppendFile - appends the file "src" to the file "dst"
 func AppendFile(dst string, src string) error {
-	appendFile, err := os.OpenFile(dst, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0666)
+	appendFile, err := os.OpenFile(dst, os.O_WRONLY|os.O_APPEND|os.O_CREATE|os.O_SYNC, 0666)
 	if err != nil {
 		return err
 	}