diff --git a/CMakeLists.txt b/CMakeLists.txt
index b168077b3..0380b8a2f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -131,7 +131,7 @@ endif()
 
 if(NOT (${Boost_VERSION} LESS 105600))
 	message("Ignoring Boost restriction on optional lvalue assignment from rvalues")
-	add_definitions(-DBOOST_OPTIONAL_ALLOW_BINDING_TO_RVALUES)
+	add_definitions(-DBOOST_OPTIONAL_ALLOW_BINDING_TO_RVALUES -DBOOST_OPTIONAL_CONFIG_ALLOW_BINDING_TO_RVALUES)
 endif()
 
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