diff --git a/include/boost/intrusive_ptr.hpp b/include/boost/intrusive_ptr.hpp
index 57e8c87..6135bb6 100644
--- a/include/boost/intrusive_ptr.hpp
+++ b/include/boost/intrusive_ptr.hpp
@@ -126,12 +126,6 @@ public:
         return p_ != 0;
     }
 
-private:
-
-    operator int () const;
-
-public:
-
 #else
 
     typedef T * (intrusive_ptr::*unspecified_bool_type) () const;
diff --git a/include/boost/scoped_array.hpp b/include/boost/scoped_array.hpp
index fd770bc..6d33a56 100644
--- a/include/boost/scoped_array.hpp
+++ b/include/boost/scoped_array.hpp
@@ -93,12 +93,6 @@ public:
         return ptr != 0;
     }
 
-private:
-
-    operator int () const;
-
-public:
-
 #else
 
     typedef T * (this_type::*unspecified_bool_type)() const;
diff --git a/include/boost/scoped_ptr.hpp b/include/boost/scoped_ptr.hpp
index 5c07ebd..464822b 100644
--- a/include/boost/scoped_ptr.hpp
+++ b/include/boost/scoped_ptr.hpp
@@ -110,12 +110,6 @@ public:
         return ptr != 0;
     }
 
-private:
-
-    operator int () const;
-
-public:
-
 #else
 
     typedef T * (this_type::*unspecified_bool_type)() const;
diff --git a/include/boost/shared_array.hpp b/include/boost/shared_array.hpp
index 68420a2..5ee8ff7 100644
--- a/include/boost/shared_array.hpp
+++ b/include/boost/shared_array.hpp
@@ -102,12 +102,6 @@ public:
         return px != 0;
     }
 
-private:
-
-    operator int () const;
-
-public:
-
 #else
 
     typedef T * (this_type::*unspecified_bool_type)() const;
diff --git a/include/boost/shared_ptr.hpp b/include/boost/shared_ptr.hpp
index 0040fb4..8cb6d1e 100644
--- a/include/boost/shared_ptr.hpp
+++ b/include/boost/shared_ptr.hpp
@@ -253,12 +253,6 @@ public:
         return px != 0;
     }
 
-private:
-
-    operator int () const;
-
-public:
-
 #else
 
     typedef T * (this_type::*unspecified_bool_type)() const;