diff --git a/mozilla/widget/src/os2/nsDeviceContextSpecOS2.cpp b/mozilla/widget/src/os2/nsDeviceContextSpecOS2.cpp
index 706712e46f7..736ae77451a 100644
--- a/mozilla/widget/src/os2/nsDeviceContextSpecOS2.cpp
+++ b/mozilla/widget/src/os2/nsDeviceContextSpecOS2.cpp
@@ -20,6 +20,7 @@
  *
  */
 
+#include <stdlib.h>
 #include "nsDeviceContextSpecOS2.h"
 
 #include "nsReadableUtils.h"