diff --git a/core/server/config/index.js b/core/server/config/index.js
index 02a60800ac..1fe1c9635f 100644
--- a/core/server/config/index.js
+++ b/core/server/config/index.js
@@ -278,11 +278,11 @@ ConfigManager.prototype.set = function (config) {
             },
             db: {
                 extensions: ['.json', '.zip'],
-                contentTypes: ['application/octet-stream', 'application/json', 'application/zip']
+                contentTypes: ['application/octet-stream', 'application/json', 'application/zip', 'application/x-zip-compressed']
             },
             themes: {
                 extensions: ['.zip'],
-                contentTypes: ['application/zip']
+                contentTypes: ['application/zip', 'application/x-zip-compressed']
             }
         },
         deprecatedItems: ['updateCheck', 'mail.fromaddress'],