diff --git a/src/program.h b/src/program.h
index d1b25e2..57f332e 100644
--- a/src/program.h
+++ b/src/program.h
@@ -22,7 +22,7 @@ struct ProgramSettings {
 
 extern SDL_Window* g_window;
 
-extern int program_run(const struct ProgramSettings* settings);
+extern void program_run(const struct ProgramSettings* settings);
 extern void program_quit();
 extern void program_handle_events();
 extern void program_handle_windowevent(SDL_WindowEvent* event);