diff --git a/include/boost/scoped_array.hpp b/include/boost/scoped_array.hpp
index a62ba2b..8c7fdcc 100644
--- a/include/boost/scoped_array.hpp
+++ b/include/boost/scoped_array.hpp
@@ -75,12 +75,12 @@ public:
 
     operator unspecified_bool_type() const // never throws
     {
-        return px == 0? 0: &this_type::get;
+        return ptr == 0? 0: &this_type::get;
     }
 
     bool operator! () const // never throws
     {
-        return px == 0;
+        return ptr == 0;
     }
 
     void swap(scoped_array & b) // never throws
diff --git a/include/boost/scoped_ptr.hpp b/include/boost/scoped_ptr.hpp
index 73737e9..738ad1b 100644
--- a/include/boost/scoped_ptr.hpp
+++ b/include/boost/scoped_ptr.hpp
@@ -91,12 +91,12 @@ public:
 
     operator unspecified_bool_type() const // never throws
     {
-        return px == 0? 0: &this_type::get;
+        return ptr == 0? 0: &this_type::get;
     }
 
     bool operator! () const // never throws
     {
-        return px == 0;
+        return ptr == 0;
     }
 
     void swap(scoped_ptr & b) // never throws