diff --git a/beos/download.cpp b/beos/download.cpp
index 6145caf0c..ea0271e60 100644
--- a/beos/download.cpp
+++ b/beos/download.cpp
@@ -19,6 +19,7 @@
 #define __STDBOOL_H__	1
 #include <stdbool.h>
 #include <sys/types.h>
+#include <stdlib.h>
 
 extern "C" {
 #include "desktop/download.h"
diff --git a/beos/fetch_rsrc.cpp b/beos/fetch_rsrc.cpp
index 917e759fa..a2c818482 100644
--- a/beos/fetch_rsrc.cpp
+++ b/beos/fetch_rsrc.cpp
@@ -20,6 +20,7 @@
 /* rsrc: URL handling. */
 
 #define __STDBOOL_H__	1
+#include <stdlib.h>
 #include <assert.h>
 #include <errno.h>
 #include <stdbool.h>
diff --git a/beos/window.cpp b/beos/window.cpp
index ebf250a6f..f6fc50420 100644
--- a/beos/window.cpp
+++ b/beos/window.cpp
@@ -19,6 +19,7 @@
  */
 
 #define __STDBOOL_H__	1
+#include <stdlib.h>
 #include <assert.h>
 extern "C" {
 #include "content/content.h"