diff --git a/include/boost/iterator/detail/config_def.hpp b/include/boost/iterator/detail/config_def.hpp
index 06029e5..1bffd9e 100644
--- a/include/boost/iterator/detail/config_def.hpp
+++ b/include/boost/iterator/detail/config_def.hpp
@@ -26,7 +26,6 @@
 // libs/iterator/test/constant_iterator_arrow.cpp fails to compile
 // because the operator-> return is improperly deduced as a non-const
 // pointer.
-#if 1 
 
 // Recall that in general, compilers without partial specialization
 // can't strip constness.  Consider counting_iterator, which normally
@@ -43,6 +42,4 @@
 
 # define BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY 1
 
-#endif
-
 // no include guard; multiple inclusion intended