diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index b7530e8f..af94a62d 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -59,8 +59,7 @@ if(NOT MINGW AND WIN32)
     set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_DEBUG ${CMAKE_CURRENT_BINARY_DIR}/Debug)
 endif()
 
-add_subdirectory(3rd/libirc/libirc libirc)
-add_subdirectory(3rd/libirc/libircclient libircclient)
+include_directories(@libirc_includes@)
 
 # YAML
 find_package(YAML-CPP 0.6.3 QUIET)