--- a/layout/reftests/css-animations/reftest-stylo.list
+++ b/layout/reftests/css-animations/reftest-stylo.list
@@ -1,17 +1,17 @@
 # DO NOT EDIT! This is a auto-generated temporary list for Stylo testing
 == screen-animations.html screen-animations.html
 == screen-animations.html screen-animations.html
 == print-no-animations.html print-no-animations.html
 == print-no-animations.html print-no-animations.html
 == animate-opacity.html animate-opacity.html
 == animate-preserves3d.html animate-preserves3d.html
 == in-visibility-hidden-animation.html in-visibility-hidden-animation.html
-skip-if(stylo) == in-visibility-hidden-animation-pseudo-element.html in-visibility-hidden-animation-pseudo-element.html # Bug 1331047
+== in-visibility-hidden-animation-pseudo-element.html in-visibility-hidden-animation-pseudo-element.html
 == partially-out-of-view-animation.html partially-out-of-view-animation.html
 == animate-display-table-opacity.html animate-display-table-opacity.html
 # We need to run 100% opacity test case when OMTA is disabled to check that the animation creates a stacking context even if the animation is not running on the compositor
 pref(layers.offmainthreadcomposition.async-animations,false) == stacking-context-opacity-1-animation.html stacking-context-opacity-1-animation.html
 # We need to run transform:none test case when OMTA is disabled to check that the animation creates a stacking context even if the animation is not running on the compositor
 pref(layers.offmainthreadcomposition.async-animations,false) == stacking-context-transform-none-animation.html stacking-context-transform-none-animation.html
 == no-stacking-context-opacity-removing-animation-in-delay.html no-stacking-context-opacity-removing-animation-in-delay.html
 == no-stacking-context-transform-removing-animation-in-delay.html no-stacking-context-transform-removing-animation-in-delay.html