diff --git a/VersatileToolboxSystem-core/VersatileToolboxSystem-core-3.1.ckan b/VersatileToolboxSystem-core/VersatileToolboxSystem-core-3.1.ckan
index 3142fe0e08..3c2078321f 100644
--- a/VersatileToolboxSystem-core/VersatileToolboxSystem-core-3.1.ckan
+++ b/VersatileToolboxSystem-core/VersatileToolboxSystem-core-3.1.ckan
@@ -41,5 +41,10 @@
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+    },
+    "download_content_type": "application/zip",
     "x_generated_by": "netkan"
 }