diff --git a/libnixf/include/nixf/Basic/Diagnostic.h b/libnixf/include/nixf/Basic/Diagnostic.h
index a01642a56..7228c48b3 100644
--- a/libnixf/include/nixf/Basic/Diagnostic.h
+++ b/libnixf/include/nixf/Basic/Diagnostic.h
@@ -131,7 +131,7 @@ class Note : public PartialDiagnostic {
 
   [[nodiscard]] virtual const char *sname() const { return sname(kind()); }
 
-  NoteKind kind() const { return Kind; }
+  [[nodiscard]] NoteKind kind() const { return Kind; }
 
   [[nodiscard]] static const char *message(NoteKind Kind);