diff --git a/build/boost/doc/example/reference.cpp b/build/boost/doc/example/reference.cpp
index f808d0f..76a4535 100644
--- a/build/boost/doc/example/reference.cpp
+++ b/build/boost/doc/example/reference.cpp
@@ -680,7 +680,7 @@ BOOST_AUTO_TEST_CASE( demonstrates_adding_a_custom_constraint_with_boost_phoenix
 //]
 }
 
-#ifndef MOCK_NO_LAMBDAS
+#ifdef MOCK_LAMBDAS
 
 namespace constraints_example_7
 {
diff --git a/test/detail/test_is_functor.cpp b/test/detail/test_is_functor.cpp
index 5bbdd90..666558d 100644
--- a/test/detail/test_is_functor.cpp
+++ b/test/detail/test_is_functor.cpp
@@ -142,7 +142,7 @@ BOOST_AUTO_TEST_CASE( class_with_sig_is_functor )
     is_functor( sig_functor() );
 }
 
-#ifndef MOCK_NO_LAMBDAS
+#ifdef MOCK_LAMBDAS
 
 BOOST_AUTO_TEST_CASE( cxx11_lambda_is_functor )
 {
diff --git a/turtle/config.hpp b/turtle/config.hpp
index 8cce9fa..c349404 100644
--- a/turtle/config.hpp
+++ b/turtle/config.hpp
@@ -94,7 +94,7 @@
 
 #if !defined(BOOST_NO_CXX11_LAMBDAS) && !defined(BOOST_NO_LAMBDAS)
 #   ifndef MOCK_NO_LAMBDAS
-#      define MOCK_NO_LAMBDAS
+#      define MOCK_LAMBDAS
 #   endif
 #endif