diff --git a/Sources/SourceKitLSP/Swift/Diagnostic.swift b/Sources/SourceKitLSP/Swift/Diagnostic.swift
index 136cc7540..f1c41fa72 100644
--- a/Sources/SourceKitLSP/Swift/Diagnostic.swift
+++ b/Sources/SourceKitLSP/Swift/Diagnostic.swift
@@ -263,7 +263,7 @@ extension Diagnostic {
       severity: severity,
       code: code,
       codeDescription: codeDescription,
-      source: "sourcekitd",
+      source: "SourceKit",
       message: message,
       tags: tags,
       relatedInformation: notes,
@@ -297,7 +297,7 @@ extension Diagnostic {
       severity: diag.diagMessage.severity.lspSeverity,
       code: nil,
       codeDescription: nil,
-      source: "SwiftSyntax",
+      source: "SourceKit",
       message: diag.message,
       tags: nil,
       relatedInformation: relatedInformation,