diff --git a/app/models/survey.rb b/app/models/survey.rb
index ba37e5ac10..4ba447eb0d 100644
--- a/app/models/survey.rb
+++ b/app/models/survey.rb
@@ -25,11 +25,14 @@ def initialize(public_body)
   def url
     return Survey.url if user_too_identifiable?
 
-    Addressable::URI.parse(Survey.url).tap do |url|
-      url.query_values = (url.query_values || {}).merge(
-        authority_id: public_body.to_param
-      )
-    end.to_s
+    uri = URI(Survey.url)
+
+    new_query = Hash[URI.decode_www_form(uri.query.to_s)].merge(
+      authority_id: public_body.to_param
+    )
+    uri.query = URI.encode_www_form(new_query)
+
+    uri.to_s
   end
 
   protected
diff --git a/config/initializers/alaveteli.rb b/config/initializers/alaveteli.rb
index 266b99d96f..9ea6258c3e 100644
--- a/config/initializers/alaveteli.rb
+++ b/config/initializers/alaveteli.rb
@@ -10,7 +10,7 @@
 load "util.rb"
 
 # Application version
-ALAVETELI_VERSION = '0.39.1.2'
+ALAVETELI_VERSION = '0.39.1.3'
 
 # Add new inflection rules using the following format
 # (all these examples are active by default):
diff --git a/doc/CHANGES.md b/doc/CHANGES.md
index d7c886b6b9..b80bafbe83 100644
--- a/doc/CHANGES.md
+++ b/doc/CHANGES.md
@@ -1,3 +1,9 @@
+# 0.39.1.3
+
+## Highlighted Features
+
+* Fix broken alert-survey script (Graeme Porteous)
+
 # 0.39.1.2
 
 ## Highlighted Features