diff --git a/clang/lib/AST/Interp/InterpBlock.h b/clang/lib/AST/Interp/InterpBlock.h
index 4ab67ebb9eaaf..9d0c4859fd06c 100644
--- a/clang/lib/AST/Interp/InterpBlock.h
+++ b/clang/lib/AST/Interp/InterpBlock.h
@@ -49,7 +49,7 @@ enum PrimType : unsigned;
 class Block final {
 public:
   /// Creates a new block.
-  Block(const std::optional<unsigned> &DeclID, Descriptor *Desc,
+  Block(const std::optional<unsigned> &DeclID, const Descriptor *Desc,
         bool IsStatic = false, bool IsExtern = false)
       : DeclID(DeclID), IsStatic(IsStatic), IsExtern(IsExtern), Desc(Desc) {}