diff --git a/lib/steep/server/master.rb b/lib/steep/server/master.rb
index 1231d1266..ef5c92b43 100644
--- a/lib/steep/server/master.rb
+++ b/lib/steep/server/master.rb
@@ -472,10 +472,9 @@ def process_message_from_client(message)
               controller.push_changes(path)
 
               case type
-              when 1, 2
+              when LSP::Constant::FileChangeType::CREATED, LSP::Constant::FileChangeType::CHANGED
                 content = path.read
-              when 4
-                # Deleted
+              when LSP::Constant::FileChangeType::DELETED
                 content = ""
               end
 
diff --git a/sig/shims/language-server_protocol.rbs b/sig/shims/language-server_protocol.rbs
index 93e02fd50..41ef5f8dd 100644
--- a/sig/shims/language-server_protocol.rbs
+++ b/sig/shims/language-server_protocol.rbs
@@ -142,6 +142,14 @@ module LanguageServer
       end
 
       TextDocumentSyncKind: __todo__
+
+      module FileChangeType
+        CREATED: 1
+        CHANGED: 2
+        DELETED: 3
+
+        type t = 1 | 2 | 3
+      end
     end
 
     module Interface