--- a/layout/style/test/mochitest.ini
+++ b/layout/style/test/mochitest.ini
@@ -65,17 +65,16 @@ skip-if = (stylo && !e10s) # mochitest e
 skip-if = (stylo && !e10s) # mochitest expectations are different with non-e10s, bug 1362292
 [test_animations_pausing.html]
 support-files = file_animations_pausing.html
 [test_animations_playbackrate.html]
 support-files = file_animations_playbackrate.html
 [test_animations_reverse.html]
 support-files = file_animations_reverse.html
 [test_animations_styles_on_event.html]
-skip-if = stylo # timeout bug 1328505
 support-files = file_animations_styles_on_event.html
 [test_animations_with_disabled_properties.html]
 support-files = file_animations_with_disabled_properties.html
 [test_any_dynamic.html]
 [test_asyncopen2.html]
 [test_at_rule_parse_serialize.html]
 [test_attribute_selector_eof_behavior.html]
 [test_background_blend_mode.html]