diff --git a/selfupdate/restart_unix.go b/selfupdate/restart_unix.go
index d4ceae0..20f812b 100644
--- a/selfupdate/restart_unix.go
+++ b/selfupdate/restart_unix.go
@@ -7,7 +7,7 @@ import (
 	"syscall"
 )
 
-// restart replaces this process with the new binary, with the same arguments and environment.
-func restart(exe string) error {
+// Restart replaces this process with the new binary, with the same arguments and environment.
+func Restart(exe string) error {
 	return syscall.Exec(exe, os.Args, os.Environ())
 }
diff --git a/selfupdate/restart_windows.go b/selfupdate/restart_windows.go
index 1d0d2ba..8681be2 100644
--- a/selfupdate/restart_windows.go
+++ b/selfupdate/restart_windows.go
@@ -2,6 +2,6 @@ package selfupdate
 
 import "errors"
 
-func restart(string) error {
+func Restart(string) error {
 	return errors.New("restarting in place is not supported on Windows")
 }
diff --git a/selfupdate/selfupdate.go b/selfupdate/selfupdate.go
index 457c20a..9662dbd 100644
--- a/selfupdate/selfupdate.go
+++ b/selfupdate/selfupdate.go
@@ -72,7 +72,7 @@ func (c *Config) defaults() {
 		c.Verify = verifyRuns(c.App)
 	}
 	if c.Restart == nil {
-		c.Restart = restart
+		c.Restart = Restart
 	}
 	c.Server = strings.TrimRight(c.Server, "/")
 }