diff --git a/CMakeLists.txt b/CMakeLists.txt
index 07cfa70..2795d79 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,11 +1,13 @@
 cmake_minimum_required(VERSION 3.15)
 
+set(CMAKE_C_STANDARD 11)
+
 add_subdirectory(lib/interop)
 
 set(SIMPLE_SRCS
-    simple.h
+    interop.c
     simple.c
-    interop.c)
+    simple.h)
 if(WIN32)
     list(APPEND SIMPLE_SRCS
         windows/resource.h