diff --git a/include/boost/intrusive/detail/utilities.hpp b/include/boost/intrusive/detail/utilities.hpp
index 2e018c9..2528aba 100644
--- a/include/boost/intrusive/detail/utilities.hpp
+++ b/include/boost/intrusive/detail/utilities.hpp
@@ -498,7 +498,8 @@ inline std::size_t floor_log2 (std::size_t x)
 
 inline float fast_log2 (float val)
 {
-   boost::uint32_t * const exp_ptr = reinterpret_cast <boost::uint32_t *>(&val);
+  boost::uint32_t * const exp_ptr = 
+     static_cast <boost::uint32_t * const>(static_cast<void * const >(&val));
    boost::uint32_t x = *exp_ptr;
    const int log_2 = (int)(((x >> 23) & 255) - 128);
    x &= ~(255 << 23);