diff --git a/include/boost/smart_ptr/detail/shared_count.hpp b/include/boost/smart_ptr/detail/shared_count.hpp
index 85e6b1f..a3ae638 100644
--- a/include/boost/smart_ptr/detail/shared_count.hpp
+++ b/include/boost/smart_ptr/detail/shared_count.hpp
@@ -489,11 +489,13 @@ public:
         return pi_ == 0;
     }
 
-    friend inline bool operator==(shared_count const & a, shared_count const & b) BOOST_SP_NOEXCEPT
+    bool operator==( shared_count const & r ) const BOOST_SP_NOEXCEPT
     {
-        return a.pi_ == b.pi_;
+        return pi_ == r.pi_;
     }
 
+    bool operator==( weak_count const & r ) const BOOST_SP_NOEXCEPT;
+
     bool operator<( shared_count const & r ) const BOOST_SP_NOEXCEPT
     {
         return std::less<sp_counted_base *>()( pi_, r.pi_ );
@@ -622,9 +624,14 @@ public:
         return pi_ == 0;
     }
 
-    friend inline bool operator==(weak_count const & a, weak_count const & b) BOOST_SP_NOEXCEPT
+    bool operator==( weak_count const & r ) const BOOST_SP_NOEXCEPT
     {
-        return a.pi_ == b.pi_;
+        return pi_ == r.pi_;
+    }
+
+    bool operator==( shared_count const & r ) const BOOST_SP_NOEXCEPT
+    {
+        return pi_ == r.pi_;
     }
 
     bool operator<( weak_count const & r ) const BOOST_SP_NOEXCEPT
@@ -660,6 +667,11 @@ inline shared_count::shared_count( weak_count const & r, sp_nothrow_tag ) BOOST_
     }
 }
 
+inline bool shared_count::operator==( weak_count const & r ) const BOOST_SP_NOEXCEPT
+{
+    return pi_ == r.pi_;
+}
+
 inline bool shared_count::operator<( weak_count const & r ) const BOOST_SP_NOEXCEPT
 {
     return std::less<sp_counted_base *>()( pi_, r.pi_ );