diff --git a/mozilla/cmd/macfe/restext/MacXPStrings.c b/mozilla/cmd/macfe/restext/MacXPStrings.c
index 92df2a34ad2..8ff65209b79 100644
--- a/mozilla/cmd/macfe/restext/MacXPStrings.c
+++ b/mozilla/cmd/macfe/restext/MacXPStrings.c
@@ -28,6 +28,7 @@
 /*END NEW NEW_STRING_LIB*/
 
 /* the prefix file should have already defined OTUNIXERRORS at this stage */
+#define OTUNIXERRORS 1
 #include "OpenTransport.h"