diff --git a/app/controllers/address_search_controller.rb b/app/controllers/address_search_controller.rb
index 1e225525a..616d5b702 100644
--- a/app/controllers/address_search_controller.rb
+++ b/app/controllers/address_search_controller.rb
@@ -18,7 +18,7 @@ class AddressSearchController < ApplicationController
       end
     elsif query.match?(/[a-zA-Z]/)
       # Query contains letters, assume it's an address
-      service = AddressClient.new(query)
+      service = AddressClient.new(query, { minmatch: 0.2 })
       service.call
 
       if service.error.present?
@@ -32,7 +32,7 @@ class AddressSearchController < ApplicationController
       end
     else
       # Query is ambiguous, use both APIs and merge results
-      address_service = AddressClient.new(query)
+      address_service = AddressClient.new(query, { minmatch: 0.2 })
       uprn_service = UprnClient.new(query)
 
       address_service.call
diff --git a/app/services/address_client.rb b/app/services/address_client.rb
index 81c8da7ed..20cf603fe 100644
--- a/app/services/address_client.rb
+++ b/app/services/address_client.rb
@@ -7,8 +7,9 @@ class AddressClient
   ADDRESS = "api.os.uk".freeze
   PATH = "/search/places/v1/find".freeze
 
-  def initialize(address)
+  def initialize(address, options = {})
     @address = address
+    @options = options
   end
 
   def call
@@ -43,8 +44,8 @@ private
     params = {
       query: address,
       key: ENV["OS_DATA_KEY"],
-      maxresults: 10,
-      minmatch: 0.4,
+      maxresults: @options[:maxresults] || 10,
+      minmatch: @options[:minmatch] || 0.4,
     }
     uri.query = URI.encode_www_form(params)
     uri.to_s