diff --git a/inspireatomclientdialog.py b/inspireatomclientdialog.py
index e8b366f..eea2519 100644
--- a/inspireatomclientdialog.py
+++ b/inspireatomclientdialog.py
@@ -709,7 +709,9 @@ def buildfilename(self, url):
         else:
             # TODO: use Mime-Type
             extension = "ext"
-            if url.lower().find("tif") > -1:
+            if url.lower().find("zip") > -1:
+                extension = "zip"
+            elif url.lower().find("tif") > -1:
                 extension = "tiff"
             elif url.lower().find("gml") > -1:
                 extension = "gml"