diff --git a/crates/rust-analyzer/src/handlers/request.rs b/crates/rust-analyzer/src/handlers/request.rs
index 23383e17fbc3..b8c2124531a8 100644
--- a/crates/rust-analyzer/src/handlers/request.rs
+++ b/crates/rust-analyzer/src/handlers/request.rs
@@ -481,27 +481,28 @@ pub(crate) fn handle_document_diagnostics(
     snap: GlobalStateSnapshot,
     params: lsp_types::DocumentDiagnosticParams,
 ) -> anyhow::Result<lsp_types::DocumentDiagnosticReportResult> {
-    const EMPTY: lsp_types::DocumentDiagnosticReportResult =
+    let empty = || {
         lsp_types::DocumentDiagnosticReportResult::Report(
             lsp_types::DocumentDiagnosticReport::Full(
                 lsp_types::RelatedFullDocumentDiagnosticReport {
                     related_documents: None,
                     full_document_diagnostic_report: lsp_types::FullDocumentDiagnosticReport {
-                        result_id: None,
+                        result_id: Some("rust-analyzer".to_owned()),
                         items: vec![],
                     },
                 },
             ),
-        );
+        )
+    };
 
     let file_id = from_proto::file_id(&snap, &params.text_document.uri)?;
     let source_root = snap.analysis.source_root_id(file_id)?;
     if !snap.analysis.is_local_source_root(source_root)? {
-        return Ok(EMPTY);
+        return Ok(empty());
     }
     let config = snap.config.diagnostics(Some(source_root));
     if !config.enabled {
-        return Ok(EMPTY);
+        return Ok(empty());
     }
     let line_index = snap.file_line_index(file_id)?;
     let supports_related = snap.config.text_document_diagnostic_related_document_support();
@@ -529,7 +530,7 @@ pub(crate) fn handle_document_diagnostics(
     Ok(lsp_types::DocumentDiagnosticReportResult::Report(
         lsp_types::DocumentDiagnosticReport::Full(lsp_types::RelatedFullDocumentDiagnosticReport {
             full_document_diagnostic_report: lsp_types::FullDocumentDiagnosticReport {
-                result_id: None,
+                result_id: Some("rust-analyzer".to_owned()),
                 items: diagnostics.collect(),
             },
             related_documents: related_documents.is_empty().not().then(|| {
@@ -539,7 +540,10 @@ pub(crate) fn handle_document_diagnostics(
                         (
                             to_proto::url(&snap, id),
                             lsp_types::DocumentDiagnosticReportKind::Full(
-                                lsp_types::FullDocumentDiagnosticReport { result_id: None, items },
+                                lsp_types::FullDocumentDiagnosticReport {
+                                    result_id: Some("rust-analyzer".to_owned()),
+                                    items,
+                                },
                             ),
                         )
                     })