diff --git a/components/style/stylist.rs b/components/style/stylist.rs
index 42f210d0325..6494b4f35b6 100644
--- a/components/style/stylist.rs
+++ b/components/style/stylist.rs
@@ -240,6 +240,10 @@ impl DocumentCascadeData {
     {
         debug_assert_ne!(origin, Origin::UserAgent);
 
+        if !flusher.origin_dirty(origin) {
+            return Ok(());
+        }
+
         let validity = flusher.data_validity(origin);
 
         match validity {