diff --git a/readline/prompt.go b/readline/prompt.go
index 64124cc..699abec 100644
--- a/readline/prompt.go
+++ b/readline/prompt.go
@@ -16,7 +16,7 @@ func (rl *Instance) SetPrompt(s string) {
 
 // SetRightPrompt sets the right prompt.
 func (rl *Instance) SetRightPrompt(s string) {
-	rl.rightPrompt = s
+	rl.rightPrompt = s + " "
 	rl.computePrompt()
 }