--- a/layout/base/nsPresContext.cpp
+++ b/layout/base/nsPresContext.cpp
@@ -2014,21 +2014,26 @@ nsPresContext::MediaFeatureValuesChanged
     // changes yet.
     if (mShell->StyleSet()->IsGecko()) {
       if (mShell->StyleSet()->AsGecko()->MediumFeaturesChanged()) {
         aRestyleHint |= eRestyle_Subtree;
       }
     } else {
       NS_WARNING("stylo: ServoStyleSets don't support responding to medium "
                  "changes yet. See bug 1290228.");
+      aRestyleHint |= eRestyle_Subtree;
     }
   }
 
   if (mUsesViewportUnits && mPendingViewportChange) {
     // Rebuild all style data without rerunning selector matching.
+    //
+    // TODO(emilio, bug 1328652): We don't set mUsesViewportUnits in stylo yet.
+    // This is wallpapered given we assume medium feature changes
+    // unconditionally, but we need to fix this.
     aRestyleHint |= eRestyle_ForceDescendants;
   }
 
   if (aRestyleHint || aChangeHint) {
     RebuildAllStyleData(aChangeHint, aRestyleHint);
   }
 
   mPendingViewportChange = false;