diff --git a/CMakeLists.txt b/CMakeLists.txt
index 12a486c0645a80aa1e02e21bb6942c7a2a971658..e2096b2e1804b4f51ddf932d33bec5669b099e88 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -56,7 +56,7 @@ message ( STATUS "ROOT_VERSION: ${ROOT_VERSION}" )
 #
 # Include Boost
 #
-find_package( Boost REQUIRED )
+find_package( Boost 1.49 REQUIRED )
 add_definitions( -DBOOST_SPIRIT_USE_PHOENIX_V3 )
 #---------------------------------------------------------------------------------------------------
 #fg: moved to here from DD4hep.cmake to not force CMAKE_CXX_FLAGS upon dependent packages