diff --git a/crates/gen_lsp_server/src/msg.rs b/crates/gen_lsp_server/src/msg.rs
index 1e5384380f..22d273d55a 100644
--- a/crates/gen_lsp_server/src/msg.rs
+++ b/crates/gen_lsp_server/src/msg.rs
@@ -55,6 +55,7 @@ pub enum ErrorCode {
     ServerNotInitialized = -32002,
     UnknownErrorCode = -32001,
     RequestCancelled = -32800,
+    ContentModified = -32801,
 }
 
 #[derive(Debug, Serialize, Deserialize, Clone)]
diff --git a/crates/ra_lsp_server/src/main_loop.rs b/crates/ra_lsp_server/src/main_loop.rs
index eab82ee859..16a52c6d6b 100644
--- a/crates/ra_lsp_server/src/main_loop.rs
+++ b/crates/ra_lsp_server/src/main_loop.rs
@@ -417,7 +417,7 @@ impl<'a> PoolDispatcher<'a> {
                                 if is_canceled(&e) {
                                     RawResponse::err(
                                         id,
-                                        ErrorCode::RequestCancelled as i32,
+                                        ErrorCode::ContentModified as i32,
                                         e.to_string(),
                                     )
                                 } else {