diff --git a/legacy/eina/src/include/eina_rbtree.h b/legacy/eina/src/include/eina_rbtree.h
index a8199a5f84..9fec606608 100644
--- a/legacy/eina/src/include/eina_rbtree.h
+++ b/legacy/eina/src/include/eina_rbtree.h
@@ -19,6 +19,8 @@
 #ifndef EINA_RBTREE_H__
 #define EINA_RBTREE_H__
 
+#include <stdlib.h>
+
 #include "eina_types.h"
 #include "eina_error.h"
 #include "eina_iterator.h"