diff --git a/xpfe/bootstrap/nsNativeAppSupportOS2.cpp b/xpfe/bootstrap/nsNativeAppSupportOS2.cpp
index 1cc6a15f0447..751045bdbda7 100644
--- a/xpfe/bootstrap/nsNativeAppSupportOS2.cpp
+++ b/xpfe/bootstrap/nsNativeAppSupportOS2.cpp
@@ -66,6 +66,7 @@
 
 
 #include <sys/stat.h>
+#include <stdlib.h>
 
 #include "prprf.h"