diff --git a/doc/27_ref_optional_synopsis.qbk b/doc/27_ref_optional_synopsis.qbk
index d86967b..d0df811 100644
--- a/doc/27_ref_optional_synopsis.qbk
+++ b/doc/27_ref_optional_synopsis.qbk
@@ -16,10 +16,10 @@
     namespace boost {
 
     class in_place_init_t { /* see below */ } ; ``[link reference_in_place_init __GO_TO__]``
-    const in_place_init_t in_place_init ( /* see below */ ) ;
+    inline constexpr in_place_init_t in_place_init ( /* see below */ ) ;
 
     class in_place_init_if_t { /*see below*/ } ; ``[link reference_in_place_init_if __GO_TO__]``
-    const in_place_init_if_t in_place_init_if ( /*see below*/ ) ;
+    inline constexpr in_place_init_if_t in_place_init_if ( /*see below*/ ) ;
 
     template <class T>
     class optional ; ``[link reference_operator_template __GO_TO__]``
diff --git a/doc/91_relnotes.qbk b/doc/91_relnotes.qbk
index 8b1a9e8..ed16e73 100644
--- a/doc/91_relnotes.qbk
+++ b/doc/91_relnotes.qbk
@@ -17,6 +17,7 @@
 * Dropped dependency on Boost.Utility.
 * Dropped dependency on Boost.Predef.
 * A bit faster implementation of some relational operations.
+* Tags `in_place_init` and `in_place_init_if` become `inline constexpr` and therewith leave smaller footprint in the executable. This addresses [@https://github.com/boostorg/optional/issues/103 issue #103].
 
 
 [heading Boost Release 1.85]
diff --git a/include/boost/none.hpp b/include/boost/none.hpp
index 5f927cc..3e7a950 100644
--- a/include/boost/none.hpp
+++ b/include/boost/none.hpp
@@ -50,7 +50,7 @@ namespace {
 
 #else
 
-BOOST_INLINE_VARIABLE BOOST_CONSTEXPR_OR_CONST none_t none ((none_t::init_tag()));
+BOOST_INLINE_CONSTEXPR none_t none ((none_t::init_tag()));
 
 #endif // older definitions
 
diff --git a/include/boost/optional/optional.hpp b/include/boost/optional/optional.hpp
index 6be4535..df3c8a3 100644
--- a/include/boost/optional/optional.hpp
+++ b/include/boost/optional/optional.hpp
@@ -103,17 +103,17 @@ namespace optional_ns {
 struct in_place_init_t
 {
   struct init_tag{};
-  explicit in_place_init_t(init_tag){}
+  BOOST_CONSTEXPR explicit in_place_init_t(init_tag){}
 };
-const in_place_init_t in_place_init ((in_place_init_t::init_tag()));
+BOOST_INLINE_CONSTEXPR in_place_init_t in_place_init ((in_place_init_t::init_tag()));
 
 // a tag for conditional in-place initialization of contained value
 struct in_place_init_if_t
 {
   struct init_tag{};
-  explicit in_place_init_if_t(init_tag){}
+  BOOST_CONSTEXPR explicit in_place_init_if_t(init_tag){}
 };
-const in_place_init_if_t in_place_init_if ((in_place_init_if_t::init_tag()));
+BOOST_INLINE_CONSTEXPR in_place_init_if_t in_place_init_if ((in_place_init_if_t::init_tag()));
 
 } // namespace optional_ns