diff --git a/libkholidays/CMakeLists.txt b/libkholidays/CMakeLists.txt
index 59c1afa2..43da5d78 100644
--- a/libkholidays/CMakeLists.txt
+++ b/libkholidays/CMakeLists.txt
@@ -11,6 +11,8 @@
 
 project( libkholidays )
 
+add_subdirectory( holidays )
+
 include_directories(
   ${CMAKE_CURRENT_BINARY_DIR}
   ${CMAKE_BINARY_DIR}