diff --git a/framebuffer.h b/framebuffer.h
index 067dafa..96dad14 100644
--- a/framebuffer.h
+++ b/framebuffer.h
@@ -2,6 +2,7 @@
 #define FRAMEBUFFER_H
 
 #include <cstdint>
+#include <cstdlib>
 #include <vector>
 
 struct FrameBuffer {