diff --git a/include/boost/shared_ptr.hpp b/include/boost/shared_ptr.hpp
index 9c1365f..98393c2 100644
--- a/include/boost/shared_ptr.hpp
+++ b/include/boost/shared_ptr.hpp
@@ -383,7 +383,7 @@ public:
 
     // implicit conversion to "bool"
 
-#if ( defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x530) ) || defined(__CINT__)
+#if ( defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x580) ) || defined(__CINT__)
 
     operator bool () const
     {