diff --git a/mozilla/Makefile.in b/mozilla/Makefile.in
index ba917cd1bfd..5d9ce11885e 100644
--- a/mozilla/Makefile.in
+++ b/mozilla/Makefile.in
@@ -249,6 +249,10 @@ ifndef MOZ_XUL_APP
 tier_50_dirs += themes
 endif
 
+ifdef MOZ_ENABLE_XREMOTE
+tier_50_dirs += widget/src/xremoteclient
+endif
+
 ifdef MOZ_XUL_APP
 tier_50_dirs	+= toolkit
 endif