diff --git a/internal/system/textbox.go b/internal/system/textbox.go
index e102958..2eacf80 100644
--- a/internal/system/textbox.go
+++ b/internal/system/textbox.go
@@ -480,7 +480,7 @@ func (this *textBox) handleKeyDown (key input.Key, numberPad bool) bool {
 		return true
 	case key == input.Key('a') && modifiers.Control():
 		dot.Start = 0
-		dot.End   = len(this.text) // FIXME
+		dot.End   = len(this.runes)
 		this.userSelect(dot)
 		return true
 	default: