diff --git a/PyIlmBase/config/ModuleDefine.cmake b/PyIlmBase/config/ModuleDefine.cmake
index f983683ad0..6f1c964651 100644
--- a/PyIlmBase/config/ModuleDefine.cmake
+++ b/PyIlmBase/config/ModuleDefine.cmake
@@ -33,6 +33,7 @@ function(PYILMBASE_ADD_LIBRARY_PRIV libname)
   if(PYILMBASE_CURLIB_CURBINDIR)
     target_include_directories(${libname} PRIVATE $<BUILD_INTERFACE:${PYILMBASE_CURLIB_CURBINDIR}>)
   endif()
+  target_include_directories(${libname} PUBLIC ${Boost_INCLUDE_DIR})
   target_link_libraries(${libname} PUBLIC ${PYILMBASE_CURLIB_DEPENDENCIES})
   if(PYILMBASE_CURLIB_PRIVATE_DEPS)
     target_link_libraries(${libname} PRIVATE ${PYILMBASE_CURLIB_PRIVATE_DEPS})