diff --git a/components/style/stylist.rs b/components/style/stylist.rs
index 1f7c3cb913b..ab2a9fc14fe 100644
--- a/components/style/stylist.rs
+++ b/components/style/stylist.rs
@@ -458,6 +458,11 @@ impl Stylist {
             false
         }
         self.is_device_dirty |= stylesheets.iter().any(|stylesheet| {
+            let mq = stylesheet.media.read();
+            if mq.evaluate(&self.device) != mq.evaluate(&device) {
+                return true
+            }
+
             mq_eval_changed(&stylesheet.rules.read().0, &self.device, &device)
         });