diff --git a/native/fdlibm/dtoa.c b/native/fdlibm/dtoa.c
index 5fb6aae..e710d96 100644
--- a/native/fdlibm/dtoa.c
+++ b/native/fdlibm/dtoa.c
@@ -28,6 +28,7 @@
 
 #include "mprec.h"
 #include <string.h>
+#include <stdlib.h>
 
 static int
 _DEFUN (quorem,