diff --git a/src/ast/struct_block_decoration.h b/src/ast/struct_block_decoration.h
index 54a9404..0d60912 100644
--- a/src/ast/struct_block_decoration.h
+++ b/src/ast/struct_block_decoration.h
@@ -47,9 +47,6 @@
   StructBlockDecoration* Clone(CloneContext* ctx) const override;
 };
 
-/// List of struct decorations
-using DecorationList = std::vector<Decoration*>;
-
 }  // namespace ast
 }  // namespace tint