diff --git a/src/libunwindstack/RegsInfo.h b/src/libunwindstack/RegsInfo.h
index 28b297e..d6f495b 100644
--- a/src/libunwindstack/RegsInfo.h
+++ b/src/libunwindstack/RegsInfo.h
@@ -17,6 +17,7 @@
 #pragma once
 
 #include <stdint.h>
+#include <stdlib.h>
 
 #include <unwindstack/Regs.h>