diff --git a/CMakeLists.txt b/CMakeLists.txt
index 752397fd..087ea427 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,8 +26,7 @@ endif()
 
 # ############
 # Define Project
-
-project(APP4TRIQS VERSION 2.2.0 LANGUAGES CXX)
+project(APP4TRIQS VERSION 2.2.0 LANGUAGES C CXX)
 
 # ############
 # Load TRIQS and CPP2PY