diff --git a/net_func_eval.cc b/net_func_eval.cc
index 58b7d629d..278e17299 100644
--- a/net_func_eval.cc
+++ b/net_func_eval.cc
@@ -23,10 +23,6 @@
 # include  <typeinfo>
 # include  "ivl_assert.h"
 
-#if __cplusplus < 201103L
-#define unique_ptr auto_ptr
-#endif
-
 using namespace std;
 
 /*
diff --git a/pform_types.h b/pform_types.h
index 557b2a268..02a8a9e2a 100644
--- a/pform_types.h
+++ b/pform_types.h
@@ -33,10 +33,6 @@
 # include  <map>
 # include  <memory>
 
-#if __cplusplus < 201103L
-#define unique_ptr auto_ptr
-#endif
-
 /*
  * parse-form types.
  */
@@ -425,8 +421,4 @@ extern std::ostream& operator<< (std::ostream&out, const pform_name_t&);
 extern std::ostream& operator<< (std::ostream&out, const name_component_t&that);
 extern std::ostream& operator<< (std::ostream&out, const index_component_t&that);
 
-#if __cplusplus < 201103L
-#undef unique_ptr
-#endif
-
 #endif /* IVL_pform_types_H */