diff --git a/crates/languages/src/c.rs b/crates/languages/src/c.rs
index 88be737e2b2b9d859981800806d7a752c39613e7..0f1c1c7e1b999828090f9ff0f498c744743bdeee 100644
--- a/crates/languages/src/c.rs
+++ b/crates/languages/src/c.rs
@@ -273,15 +273,16 @@ impl super::LspAdapter for CLspAdapter {
         &self,
         mut original: InitializeParams,
     ) -> Result<InitializeParams> {
-        // enable clangd's dot-to-arrow feature.
         let experimental = json!({
             "textDocument": {
                 "completion" : {
+                    // enable clangd's dot-to-arrow feature.
                     "editsNearCursor": true
                 },
-                "inactiveRegionsCapabilities": {
-                    "inactiveRegions": true,
-                }
+                // TODO: inactiveRegions support needs an implementation in clangd_ext.rs
+                // "inactiveRegionsCapabilities": {
+                //     "inactiveRegions": true,
+                // }
             }
         });
         if let Some(ref mut original_experimental) = original.capabilities.experimental {
diff --git a/crates/project/src/lsp_store/clangd_ext.rs b/crates/project/src/lsp_store/clangd_ext.rs
index c8ce07e8b6a62aa653f7ec3455f573dbb15bb467..390eb735bcdb1439a232aea3d05fa4f75ed1b59e 100644
--- a/crates/project/src/lsp_store/clangd_ext.rs
+++ b/crates/project/src/lsp_store/clangd_ext.rs
@@ -35,6 +35,10 @@ pub fn register_notifications(
     }
     let server_id = language_server.server_id();
 
+    // TODO: inactiveRegions support needs do add diagnostics, not replace them as `this.update_diagnostics` call below does
+    if true {
+        return;
+    }
     language_server
         .on_notification::<InactiveRegions, _>({
             let adapter = adapter.clone();