diff --git a/CMakeLists.txt b/CMakeLists.txt
index 01e5f44..8fe8e89 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -43,7 +43,7 @@ target_link_libraries(
 
 target_include_directories(
     ikarus PRIVATE
-    ${Boost_INCLUDE_DIRS}
+    ${Boost_INCLUDE_DIR}
 )
 
 if (LIBIKARUS_ENABLE_LINTS)
@@ -91,4 +91,4 @@ if (LIBIKARUS_BUILD_DOCS)
         libikarus_tests
         libikarus_docs
     )
-endif ()
\ No newline at end of file
+endif ()