diff --git a/latex2edx/main.py b/latex2edx/main.py
index 5600d02..8bd6a6a 100644
--- a/latex2edx/main.py
+++ b/latex2edx/main.py
@@ -1129,8 +1129,8 @@ def process_askta(self, tree):
             mailto = 'mailto:%s' % data['to']
             data.pop('to')
             body = data.pop('body')
-            mailto += '?' + urllib.urlencode(data)
-            mailto += '&' + urllib.urlencode({'body': body})
+            mailto += '?' + urllib.urlencode(data).replace('+', '%20')
+            mailto += '&' + urllib.urlencode({'body': body}).replace('+', '%20')
 
             jscode = ('\nfunction %s() {\n'
                       '    var cu = encodeURI(window.location.origin + $("#%s").attr("href"));\n'