diff --git a/CMakeLists.txt b/CMakeLists.txt
index 31f2dca..623d22d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,7 +21,7 @@
 #    distribution.
 
 cmake_minimum_required(VERSION 2.8)
-project(TrippyCube CXX)
+project(TrippyCube C CXX)
 
 # Binary filename
 set(TARGET_NAME "trippy-cube")
diff --git a/src/globals.hpp b/src/globals.h
similarity index 98%
rename from src/globals.hpp
rename to src/globals.h
index 81cac89..71afa83 100644
--- a/src/globals.hpp
+++ b/src/globals.h
@@ -34,6 +34,8 @@
 #define SCREEN_WIDTH 800
 #define SCREEN_HEIGHT 600
 
+extern "C" {
 extern SDL_Window *window;
 extern GLuint program_id;
 extern GLuint matrix_id;
+}
diff --git a/src/main.cpp b/src/main.cpp
index f06174a..7562e8d 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -28,7 +28,7 @@
 #include <GL/glew.h>
 #include <GL/gl.h>
 
-#include "globals.hpp"
+#include "globals.h"
 #include "shaders.hpp"
 #include "simulation.hpp"
 
diff --git a/src/simulation.cpp b/src/simulation.cpp
index f9d6225..0c7364e 100644
--- a/src/simulation.cpp
+++ b/src/simulation.cpp
@@ -29,7 +29,7 @@
 #include <glm/gtc/matrix_transform.hpp>
 #include <SDL2/SDL.h>
 
-#include "globals.hpp"
+#include "globals.h"
 #include "input.hpp"
 #include "camera.hpp"
 #include "cube.hpp"