diff --git a/lisp/international/iso-cvt.el b/lisp/international/iso-cvt.el
index f7e325b0ca3..f896773e53c 100644
--- a/lisp/international/iso-cvt.el
+++ b/lisp/international/iso-cvt.el
@@ -791,6 +791,7 @@ Optional arg BUFFER is ignored (for use in `format-alist')."
     ("ï" "ï")
     ("ð" "ð")
     ("ñ" "ñ")
+    (" " " ")
     ("ò" "ò")
     ("ó" "ó")
     ("ô" "ô")