diff --git a/expect.go b/expect.go
index 6e66841..a239046 100644
--- a/expect.go
+++ b/expect.go
@@ -17,7 +17,7 @@ import (
 type Expect struct {
 	timeout time.Duration
 	pty     io.ReadWriteCloser
-	killer  func()
+	Killer  func()
 	buffer  []byte
 
 	// channel for receiving read events
@@ -69,7 +69,7 @@ func Create(pty io.ReadWriteCloser, killer func()) (exp *Expect) {
 		pty:      pty,
 		readChan: make(chan readEvent),
 		log:      createLogManager(),
-		killer:   killer,
+		Killer:   killer,
 	}
 
 	// Start up processes
@@ -100,7 +100,7 @@ func (exp *Expect) Buffer() []byte {
 //
 // Note: This *must* be run to cleanup the process
 func (exp *Expect) Close() error {
-	exp.killer()
+	exp.Killer()
 	err := exp.pty.Close()
 	for readEvent := range exp.readChan {
 		exp.mergeRead(readEvent)