diff --git a/HISTORY.rst b/HISTORY.rst
index 0b64c29e2a..a720152eef 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -18,7 +18,8 @@
   issue #489.
 - Docker install script: Detect if Docker installed and provide help
   text if not.
-
+- Update dropzone.js' timeout from 30 seconds to 120 to allow upload
+  of large files on slow connections.
 
 3.0.1 (2018-07-08)
 =================
diff --git a/mayan/apps/sources/templates/sources/upload_multiform_subtemplate.html b/mayan/apps/sources/templates/sources/upload_multiform_subtemplate.html
index d56bfbabe8..5e72d6a95a 100644
--- a/mayan/apps/sources/templates/sources/upload_multiform_subtemplate.html
+++ b/mayan/apps/sources/templates/sources/upload_multiform_subtemplate.html
@@ -55,6 +55,7 @@
                 dictResponseError: gettext('Server responded with {{statusCode}} code.'),
                 paramName: 'source-file',
                 previewTemplate: previewTemplate,
+                timeout: 1200000
             });
         {% endverbatim %}
     });