diff --git a/include/boost/optional/detail/optional_reference_spec.hpp b/include/boost/optional/detail/optional_reference_spec.hpp
index 0069c79..622f767 100644
--- a/include/boost/optional/detail/optional_reference_spec.hpp
+++ b/include/boost/optional/detail/optional_reference_spec.hpp
@@ -66,7 +66,7 @@ void prevent_assignment_from_false_const_integral()
 {
 #ifndef BOOST_OPTIONAL_CONFIG_ALLOW_BINDING_TO_RVALUES
 #ifdef BOOST_OPTIONAL_CONFIG_NO_PROPER_ASSIGN_FROM_CONST_INT
-    // MSVC compiler without rvalue refernces: we need to disable the assignment from
+    // MSVC compiler without rvalue references: we need to disable the assignment from
     // const integral lvalue reference, as it may be an invalid temporary
     BOOST_STATIC_ASSERT_MSG(!is_const_integral<From>::value, 
                             "binding const lvalue references to integral types is disabled in this compiler");