diff --git a/quantum/quantum.h b/quantum/quantum.h
index dd290ac00c..9b5d310bd4 100644
--- a/quantum/quantum.h
+++ b/quantum/quantum.h
@@ -22,6 +22,7 @@
 #include <avr/interrupt.h>
 #include "led.h"
 #include "action_util.h"
+#include <stdlib.h>
 
 
 extern uint32_t default_layer_state;