diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9eb550f..19006cd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,7 +3,9 @@ if(COMMAND cmake_policy)
 	cmake_policy(SET CMP0003 NEW)
 endif(COMMAND cmake_policy)
 
-project(CNPY)
+project(CNPY
+  LANGUAGES CXX
+)
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")