diff --git a/core_polymorph.cpp b/core_polymorph.cpp
index a2282c2..cefc23e 100644
--- a/core_polymorph.cpp
+++ b/core_polymorph.cpp
@@ -352,6 +352,7 @@ Ast *ast_copy(Ast *ast, Ast_Scope *parent_scope, Array<Poly_Replacement> *repl)
             Ast_Array *src = (Ast_Array *)ast;
             Ast_Array *dst = ast_create_copy(parent_scope, Ast_Array, ast);
             dst->expr = (Ast_Expr *)ast_copy(src->expr, parent_scope, repl);
+            dst->base = (Ast_Expr *)ast_copy(src->base, parent_scope, repl);
             result = dst;
         } break;