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-rw-r--r--boost/math/quaternion.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/boost/math/quaternion.hpp b/boost/math/quaternion.hpp
index 7b7a1aa17d..a69147c539 100644
--- a/boost/math/quaternion.hpp
+++ b/boost/math/quaternion.hpp
@@ -11,6 +11,7 @@
#define BOOST_QUATERNION_HPP
#include <boost/config.hpp> // for BOOST_NO_STD_LOCALE
+#include <boost/math_fwd.hpp>
#include <boost/detail/workaround.hpp>
#include <boost/type_traits/is_convertible.hpp>
#include <boost/utility/enable_if.hpp>