diff --git a/lib/pact/doc/markdown/index_renderer.rb b/lib/pact/doc/markdown/index_renderer.rb
index 92945c5b..66ad1d9c 100644
--- a/lib/pact/doc/markdown/index_renderer.rb
+++ b/lib/pact/doc/markdown/index_renderer.rb
@@ -1,3 +1,5 @@
+require 'erb'
+
 module Pact
   module Doc
     module Markdown
@@ -32,7 +34,7 @@ def title
         end
 
         def item title, file_name
-          "* [#{title}](#{file_name})"
+          "* [#{title}](#{ERB::Util.url_encode(file_name)})"
         end
 
       end
diff --git a/spec/support/generated_index.md b/spec/support/generated_index.md
index 3e146a00..befffaeb 100644
--- a/spec/support/generated_index.md
+++ b/spec/support/generated_index.md
@@ -1,4 +1,4 @@
 ### Pacts for Some Consumer
 
-* [Some Provider](Some Provider.md)
-* [Some other provider](Some other provider.md)
+* [Some Provider](Some%20Provider.md)
+* [Some other provider](Some%20other%20provider.md)