diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index f7413fb..de78875 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -16,6 +16,7 @@ set(sources
 
 set(includes
 	${PROJECT_SOURCE_DIR}/include
+	${PROJECT_SOURCE_DIR}/lib/variant/include
 )
 
 set(libraries