diff --git a/lib/typeprof/lsp/server.rb b/lib/typeprof/lsp/server.rb
index 0d0d11e2..3fd9419f 100644
--- a/lib/typeprof/lsp/server.rb
+++ b/lib/typeprof/lsp/server.rb
@@ -1,3 +1,5 @@
+require "cgi"
+
 module TypeProf::LSP
   module ErrorCodes
     ParseError = -32700
@@ -65,11 +67,11 @@ def initialize(core_options, reader, writer, url_schema: nil, publish_all_diagno
 
     #: (String) -> String
     def path_to_uri(path)
-      @url_schema + File.expand_path(path)
+      @url_schema + File.expand_path(path).split("/").map {|s| CGI.escapeURIComponent(s) }.join("/")
     end
 
-    def uri_to_path(url)
-      url.delete_prefix(@url_schema)
+    def uri_to_path(uri)
+      uri.delete_prefix(@url_schema).split("/").map {|s| CGI.unescapeURIComponent(s) }.join("/")
     end
 
     #: (Array[String]) -> void