diff --git a/python/mozbuild/mozbuild/frontend/gyp_reader.py b/python/mozbuild/mozbuild/frontend/gyp_reader.py
index 36381221709a..04efc5181108 100644
--- a/python/mozbuild/mozbuild/frontend/gyp_reader.py
+++ b/python/mozbuild/mozbuild/frontend/gyp_reader.py
@@ -290,6 +290,8 @@ def process_gyp_result(gyp_result, gyp_dir_attrs, path, config, output,
             context['ASFLAGS'] = target_conf.get('asflags_mozilla', [])
             if use_defines_in_asflags and defines:
                 context['ASFLAGS'] += ['-D' + d for d in defines]
+            if config.substs['OS_TARGET'] == 'SunOS':
+                context['LDFLAGS'] = target_conf.get('ldflags', [])
             flags = target_conf.get('cflags_mozilla', [])
             if flags:
                 suffix_map = {