diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index ba3c05278..08dd1d6e5 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 2.4)
-project (eressea)
+project (eressea C)
 
 set (CORE_INCLUDE_DIR ${CMAKE_CURRENT_LIST_DIR} CACHE INTERNAL "Eressea Core headers")