diff --git a/postInstall.sh b/postInstall.sh
index 706ec10cac620686b7ddda1c18a05ecdf46e2117..625ae7629e3a25df81492e3d2e120afd7f5a90f4 100755
--- a/postInstall.sh
+++ b/postInstall.sh
@@ -31,6 +31,6 @@ do
 done
 for proto in http https ftp
 do
-    echo "export $proto_proxy=slis:3128" >> ~/.profile
+    echo "export ${proto}_proxy=slis:3128" >> ~/.profile
 done
 read -p "Configuration faite, appuyez sur n'importe quelle touche pour continuer"