diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8061f47..efd76d2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 2.8)
 
-project(ttyd)
+project(ttyd C)
 set(PROJECT_VERSION "1.6.0")
 
 find_package(Git)