diff --git a/src/ast/scalar_constructor_expression.cc b/src/ast/scalar_constructor_expression.cc
index 7a68042..23bec02 100644
--- a/src/ast/scalar_constructor_expression.cc
+++ b/src/ast/scalar_constructor_expression.cc
@@ -17,6 +17,8 @@
 #include "src/ast/clone_context.h"
 #include "src/ast/module.h"
 
+TINT_INSTANTIATE_CLASS_ID(tint::ast::ScalarConstructorExpression);
+
 namespace tint {
 namespace ast {