diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -32,7 +32,7 @@
    include_directories (
       ${CMAKE_CURRENT_BINARY_DIR}
       ${CMAKE_CURRENT_SOURCE_DIR}
-      ${Boost_INCLUDE_DIR}
+      ${Boost_INCLUDE_DIRS}
       )
    add_subdirectory (imports)
 endif ()