diff --git a/api/common/config.go b/api/common/config.go
index e4f23ad5..2e533609 100644
--- a/api/common/config.go
+++ b/api/common/config.go
@@ -55,6 +55,9 @@ type FlagStorage struct {
 	DebugFuse  bool
 	DebugS3    bool
 	Foreground bool
+
+	// MPU
+	MPUPartSize uint64
 }
 
 func (flags *FlagStorage) GetMimeType(fileName string) (retMime *string) {
diff --git a/internal/file.go b/internal/file.go
index a2ccbaa7..4a6df8aa 100644
--- a/internal/file.go
+++ b/internal/file.go
@@ -187,11 +187,11 @@ func (fh *FileHandle) partSize() uint64 {
 	var size uint64
 
 	if fh.lastPartId < 1000 {
-		size = 5 * 1024 * 1024
+		size = fh.inode.fs.flags.MPUPartSize
 	} else if fh.lastPartId < 2000 {
-		size = 25 * 1024 * 1024
+		size = 5 * fh.inode.fs.flags.MPUPartSize
 	} else {
-		size = 125 * 1024 * 1024
+		size = 5 * 5 * fh.inode.fs.flags.MPUPartSize
 	}
 
 	maxPartSize := fh.cloud.Capabilities().MaxMultipartSize
diff --git a/internal/flags.go b/internal/flags.go
index f18633a8..fd53a81a 100644
--- a/internal/flags.go
+++ b/internal/flags.go
@@ -138,6 +138,11 @@ func NewApp() (app *cli.App) {
 				Usage: "GID owner of all inodes.",
 			},
 
+			cli.IntFlag{
+				Name:  "MPUPartSize",
+				Value: 5 * 1024 * 1024,
+				Usage: "MPU part size.",
+			},
 			/////////////////////////
 			// S3
 			/////////////////////////
@@ -341,6 +346,9 @@ func PopulateFlags(c *cli.Context) (ret *FlagStorage) {
 		DebugFuse:  c.Bool("debug_fuse"),
 		DebugS3:    c.Bool("debug_s3"),
 		Foreground: c.Bool("f"),
+
+		// MPU
+		MPUPartSize: uint64(c.Int("MPUPartSize")),
 	}
 
 	// S3