diff --git a/crates/copilot/src/copilot.rs b/crates/copilot/src/copilot.rs
index 577f335d2a..7352ab6fe1 100644
--- a/crates/copilot/src/copilot.rs
+++ b/crates/copilot/src/copilot.rs
@@ -948,12 +948,9 @@ impl Copilot {
 }
 
 fn id_for_language(language: Option<&Arc<Language>>) -> String {
-    let language_name = language.map(|language| language.name());
-    match language_name.as_deref() {
-        Some("Plain Text") => "plaintext".to_string(),
-        Some(language_name) => language_name.to_lowercase(),
-        None => "plaintext".to_string(),
-    }
+    language
+        .map(|language| language.lsp_id())
+        .unwrap_or_else(|| "plaintext".to_string())
 }
 
 fn uri_for_buffer(buffer: &Model<Buffer>, cx: &AppContext) -> lsp::Url {
diff --git a/crates/language/src/language.rs b/crates/language/src/language.rs
index b701ed36c7..4db3ae92d5 100644
--- a/crates/language/src/language.rs
+++ b/crates/language/src/language.rs
@@ -152,7 +152,7 @@ pub struct CachedLspAdapter {
     pub name: LanguageServerName,
     pub disk_based_diagnostic_sources: Vec<String>,
     pub disk_based_diagnostics_progress_token: Option<String>,
-    pub language_ids: HashMap<String, String>,
+    language_ids: HashMap<String, String>,
     pub adapter: Arc<dyn LspAdapter>,
     pub reinstall_attempt_count: AtomicU64,
     /// Indicates whether this language server is the primary language server
@@ -248,6 +248,13 @@ impl CachedLspAdapter {
             .await
     }
 
+    pub fn language_id(&self, language: &Language) -> String {
+        self.language_ids
+            .get(language.name().as_ref())
+            .cloned()
+            .unwrap_or_else(|| language.lsp_id())
+    }
+
     #[cfg(any(test, feature = "test-support"))]
     fn as_fake(&self) -> Option<&FakeLspAdapter> {
         self.adapter.as_fake()
@@ -1373,6 +1380,13 @@ impl Language {
     pub fn prettier_plugins(&self) -> &Vec<Arc<str>> {
         &self.config.prettier_plugins
     }
+
+    pub fn lsp_id(&self) -> String {
+        match self.config.name.as_ref() {
+            "Plain Text" => "plaintext".to_string(),
+            language_name => language_name.to_lowercase(),
+        }
+    }
 }
 
 impl LanguageScope {
diff --git a/crates/project/src/project.rs b/crates/project/src/project.rs
index 160a371be5..40f73948d7 100644
--- a/crates/project/src/project.rs
+++ b/crates/project/src/project.rs
@@ -2386,7 +2386,6 @@ impl Project {
 
             if let Some(language) = language {
                 for adapter in self.languages.lsp_adapters(&language) {
-                    let language_id = adapter.language_ids.get(language.name().as_ref()).cloned();
                     let server = self
                         .language_server_ids
                         .get(&(worktree_id, adapter.name.clone()))
@@ -2408,7 +2407,7 @@ impl Project {
                             lsp::DidOpenTextDocumentParams {
                                 text_document: lsp::TextDocumentItem::new(
                                     uri.clone(),
-                                    language_id.unwrap_or_default(),
+                                    adapter.language_id(&language),
                                     0,
                                     initial_snapshot.text(),
                                 ),
@@ -3741,11 +3740,7 @@ impl Project {
                     lsp::DidOpenTextDocumentParams {
                         text_document: lsp::TextDocumentItem::new(
                             uri,
-                            adapter
-                                .language_ids
-                                .get(language.name().as_ref())
-                                .cloned()
-                                .unwrap_or_default(),
+                            adapter.language_id(&language),
                             version,
                             initial_snapshot.text(),
                         ),
diff --git a/crates/project/src/project_tests.rs b/crates/project/src/project_tests.rs
index e61fe15599..e974ba2bef 100644
--- a/crates/project/src/project_tests.rs
+++ b/crates/project/src/project_tests.rs
@@ -397,7 +397,7 @@ async fn test_managing_language_servers(cx: &mut gpui::TestAppContext) {
             uri: lsp::Url::from_file_path("/the-root/test.rs").unwrap(),
             version: 0,
             text: "const A: i32 = 1;".to_string(),
-            language_id: Default::default()
+            language_id: "rust".to_string(),
         }
     );
 
@@ -444,7 +444,7 @@ async fn test_managing_language_servers(cx: &mut gpui::TestAppContext) {
             uri: lsp::Url::from_file_path("/the-root/package.json").unwrap(),
             version: 0,
             text: "{\"a\": 1}".to_string(),
-            language_id: Default::default()
+            language_id: "json".to_string(),
         }
     );
 
@@ -529,7 +529,7 @@ async fn test_managing_language_servers(cx: &mut gpui::TestAppContext) {
             uri: lsp::Url::from_file_path("/the-root/test3.rs").unwrap(),
             version: 0,
             text: rust_buffer2.update(cx, |buffer, _| buffer.text()),
-            language_id: Default::default()
+            language_id: "rust".to_string(),
         },
     );
 
@@ -579,7 +579,7 @@ async fn test_managing_language_servers(cx: &mut gpui::TestAppContext) {
             uri: lsp::Url::from_file_path("/the-root/test3.json").unwrap(),
             version: 0,
             text: rust_buffer2.update(cx, |buffer, _| buffer.text()),
-            language_id: Default::default()
+            language_id: "json".to_string(),
         },
     );
 
@@ -634,7 +634,7 @@ async fn test_managing_language_servers(cx: &mut gpui::TestAppContext) {
             uri: lsp::Url::from_file_path("/the-root/test.rs").unwrap(),
             version: 0,
             text: rust_buffer.update(cx, |buffer, _| buffer.text()),
-            language_id: Default::default()
+            language_id: "rust".to_string(),
         }
     );
 
@@ -655,13 +655,13 @@ async fn test_managing_language_servers(cx: &mut gpui::TestAppContext) {
                 uri: lsp::Url::from_file_path("/the-root/package.json").unwrap(),
                 version: 0,
                 text: json_buffer.update(cx, |buffer, _| buffer.text()),
-                language_id: Default::default()
+                language_id: "json".to_string(),
             },
             lsp::TextDocumentItem {
                 uri: lsp::Url::from_file_path("/the-root/test3.json").unwrap(),
                 version: 0,
                 text: rust_buffer2.update(cx, |buffer, _| buffer.text()),
-                language_id: Default::default()
+                language_id: "json".to_string(),
             }
         ]
     );