diff --git a/ulib/install b/ulib/install
index e9d0175..2162c31 100644
--- a/ulib/install
+++ b/ulib/install
@@ -92,6 +92,9 @@ function copy_update_ask() {
     # Retourner vrai si le fichier a été copié sans erreur.
     local src="$1" dest="$2"
 
+    [ -d "$dest" ] && dest="$dest/$(basename "$src")"
+    mkdirof "$dest" || return 1
+
     [ -f "$dest" ] || copy_replace "$src" "$dest"
     if testdiff "$src" "$dest"; then
         diff -u "$dest" "$src"