diff --git a/toolkit/library/moz.build b/toolkit/library/moz.build
index 4f9b142eb3..4dd7729290 100644
--- a/toolkit/library/moz.build
+++ b/toolkit/library/moz.build
@@ -253,7 +253,6 @@ if CONFIG['MOZ_ENABLE_LIBPROXY']:
 if CONFIG['OS_ARCH'] == 'SunOS':
     OS_LIBS += [
         'elf',
-        'demangle',
         'sendfile',
     ]