diff --git a/src/add-ons/translators/rtf/Stack.h b/src/add-ons/translators/rtf/Stack.h
index 5fa6ed6b8a..837f0ed56a 100644
--- a/src/add-ons/translators/rtf/Stack.h
+++ b/src/add-ons/translators/rtf/Stack.h
@@ -7,6 +7,8 @@
 #define STACK_H
 
 
+#include <stdlib.h>
+
 #include <SupportDefs.h>