diff --git a/chapter-08/recipe-02/cxx-example/external/upstream/boost/CMakeLists.txt b/chapter-08/recipe-02/cxx-example/external/upstream/boost/CMakeLists.txt
index 4c258c338..ef8597eda 100644
--- a/chapter-08/recipe-02/cxx-example/external/upstream/boost/CMakeLists.txt
+++ b/chapter-08/recipe-02/cxx-example/external/upstream/boost/CMakeLists.txt
@@ -1,4 +1,4 @@
-find_package(Boost ${Boost_MINIMUM_REQUIRED} QUIET COMPONENTS "${BOOST_COMPONENTS_REQUIRED}")
+find_package(Boost ${Boost_MINIMUM_REQUIRED} QUIET COMPONENTS ${BOOST_COMPONENTS_REQUIRED})
 
 if(Boost_FOUND)
   message(STATUS "Found Boost version ${Boost_MAJOR_VERSION}.${Boost_MINOR_VERSION}.${Boost_SUBMINOR_VERSION}")