diff --git a/main.go b/main.go
index 95fa49d..c67bdd6 100644
--- a/main.go
+++ b/main.go
@@ -51,6 +51,7 @@ func runMain() error {
 	cacert := flags.String("cacert", "", "ca certificate to validate against")
 	opTimeout := flags.Duration("op-timeout", time.Second*60, "operation timeout")
 	maxOpsPerShell := flags.Int("max-ops-per-shell", 15, "max operations per shell")
+	maxShells := flags.Int("max-shells", 10, "max shells per user")
 	flags.Parse(os.Args[1:])
 
 	var certBytes []byte
@@ -72,6 +73,7 @@ func runMain() error {
 		CACertBytes:           certBytes,
 		OperationTimeout:      *opTimeout,
 		MaxOperationsPerShell: *maxOpsPerShell,
+		MaxShells:             *maxShells,
 	})
 	if err != nil {
 		return err
diff --git a/winrmcp/cp.go b/winrmcp/cp.go
index 5599b6d..5429d2c 100644
--- a/winrmcp/cp.go
+++ b/winrmcp/cp.go
@@ -21,7 +21,7 @@ func doCopy(client *winrm.Client, config *Config, in io.Reader, toPath string) e
 		log.Printf("Copying file to %s\n", tempPath)
 	}
 
-	err := uploadContent(client, config.MaxOperationsPerShell, "%TEMP%\\"+tempFile, in)
+	err := uploadContent(client, config.MaxShells, config.MaxOperationsPerShell, "%TEMP%\\"+tempFile, in)
 	if err != nil {
 		return errors.New(fmt.Sprintf("Error uploading file to %s: %v", tempPath, err))
 	}
@@ -47,18 +47,21 @@ func doCopy(client *winrm.Client, config *Config, in io.Reader, toPath string) e
 	return nil
 }
 
-func uploadContent(client *winrm.Client, maxChunks int, filePath string, reader io.Reader) error {
+func uploadContent(client *winrm.Client, maxShell int, maxChunks int, filePath string, reader io.Reader) error {
 	var err error
 	var piece = 0
 	var wg sync.WaitGroup
-	parallel := 4
 
 	if maxChunks == 0 {
 		maxChunks = 1
 	}
 
+	if maxChunks == 0 {
+		maxChunks = 10
+	}
+
 	// Create 4 Parallel workers
-	for p := 0; p < parallel; p++ {
+	for p := 0; p < maxShell; p++ {
 		done := make(chan bool, 1)
 		// Add worker to the WaitGroup
 		wg.Add(1)
diff --git a/winrmcp/winrmcp.go b/winrmcp/winrmcp.go
index 844c5a2..1d5b088 100644
--- a/winrmcp/winrmcp.go
+++ b/winrmcp/winrmcp.go
@@ -24,6 +24,7 @@ type Config struct {
 	CACertBytes           []byte
 	OperationTimeout      time.Duration
 	MaxOperationsPerShell int
+	MaxShells             int
 }
 
 type Auth struct {