diff --git a/mailnews/ui/messenger/resources/Makefile.in b/mailnews/ui/messenger/resources/Makefile.in
index 5e7884f3d7f..6fe6f878b1c 100644
--- a/mailnews/ui/messenger/resources/Makefile.in
+++ b/mailnews/ui/messenger/resources/Makefile.in
@@ -67,7 +67,6 @@ EXPORT_RESOURCE_SAMPLES = \
 	$(srcdir)/am-server-webmail.xul	\
 	$(srcdir)/am-copies.xul		\
 	$(srcdir)/am-advanced.xul	\
-	$(srcdir)/am.css			\
 	$(srcdir)/SearchDialog.xul	\
 	$(NULL)
 
diff --git a/mailnews/ui/messenger/resources/am.css b/mailnews/ui/messenger/resources/am.css
deleted file mode 100644
index e69de29bb2d..00000000000