diff --git a/clang/include/clang/AST/DeclTemplate.h b/clang/include/clang/AST/DeclTemplate.h
index 4d8aaea91b38..e70b29e53a25 100644
--- a/clang/include/clang/AST/DeclTemplate.h
+++ b/clang/include/clang/AST/DeclTemplate.h
@@ -80,12 +80,13 @@ protected:
                         Expr *RequiresClause);
 
 public:
+  // FIXME: remove default argument for RequiresClause
   static TemplateParameterList *Create(const ASTContext &C,
                                        SourceLocation TemplateLoc,
                                        SourceLocation LAngleLoc,
                                        ArrayRef<NamedDecl *> Params,
                                        SourceLocation RAngleLoc,
-                                       Expr *RequiresClause);
+                                       Expr *RequiresClause = nullptr);
 
   /// \brief Iterates through the template parameters in this list.
   typedef NamedDecl** iterator;