diff --git a/mozilla/calendar/libical/config.h b/mozilla/calendar/libical/config.h
index 9420fbd1b77..1921493379d 100644
--- a/mozilla/calendar/libical/config.h
+++ b/mozilla/calendar/libical/config.h
@@ -63,10 +63,8 @@
 /* Define if we want _REENTRANT */
 /* #undef ICAL_REENTRANT */
 
-/* Define to terminate lines with "
-" instead of "
-" */
-#define ICAL_UNIX_NEWLINE 1
+/* Define to terminate lines with "\n" instead of "\r\n" */
+#undef ICAL_UNIX_NEWLINE
 
 /* Define to 1 if you DO NOT WANT to see deprecated messages */
 #define NO_WARN_DEPRECATED 1
diff --git a/mozilla/calendar/libical/src/libical/autogenex/ical.h b/mozilla/calendar/libical/src/libical/autogenex/ical.h
index df0c797f3b0..b740a630961 100644
--- a/mozilla/calendar/libical/src/libical/autogenex/ical.h
+++ b/mozilla/calendar/libical/src/libical/autogenex/ical.h
@@ -71,7 +71,7 @@ extern "C" {
 #define NO_WARN_ICAL_MALFORMEDDATA_ERROR_HACK 1
 
 /* Define to terminate lines with n instead of rn */
-#define ICAL_UNIX_NEWLINE 1
+#undef ICAL_UNIX_NEWLINE
 
 /* Define if we have pthread. */
 #define HAVE_PTHREAD