diff --git a/expat/xmltok/xmldef.h b/expat/xmltok/xmldef.h
new file mode 100755
index 00000000..e165742e
--- /dev/null
+++ b/expat/xmltok/xmldef.h
@@ -0,0 +1,11 @@
+/* This file can be used for any definitions needed in
+particular environments. */
+
+#ifdef MOZILLA
+
+#include "nspr.h"
+#define malloc(x) PR_Calloc(1,(x))
+#define free(x) PR_Free(x)
+#define int int32
+
+#endif /* MOZILLA */