Index: logistic.hpp
===================================================================
--- logistic.hpp	(revision 79016)
+++ logistic.hpp	(working copy)
@@ -5,6 +5,9 @@
 // (See accompanying file LICENSE_1_0.txt
 // or copy at http://www.boost.org/LICENSE_1_0.txt)
 
+#ifndef BOOST_STATS_LOGISTIC_HPP
+#define BOOST_STATS_LOGISTIC_HPP
+
 #include <boost/math/distributions/fwd.hpp>
 #include <boost/math/distributions/detail/common_error_handling.hpp>
 #include <boost/math/distributions/complement.hpp>
@@ -287,3 +290,5 @@
 // Must come at the end:
 #include <boost/math/distributions/detail/derived_accessors.hpp>
 
+#endif //BOOST_STATS_LOGISTIC_HPP
+