diff --git a/CMakeLists.txt b/CMakeLists.txt
index d486214..5de4642 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,7 +9,7 @@ project(libeosio
 	VERSION 0.1.5
 	DESCRIPTION "C++ library for EOSIO"
 	HOMEPAGE_URL "https://github.com/eosswedenorg/libeosio"
-	LANGUAGES CXX
+	LANGUAGES C CXX
 )
 
 set( PROJECT_MAINTAINER "Henrik Hautakoski <henrik@eossweden.org>")