diff --git a/components/style/gecko/wrapper.rs b/components/style/gecko/wrapper.rs
index 15d3f785b6e..dd82ec8cea8 100644
--- a/components/style/gecko/wrapper.rs
+++ b/components/style/gecko/wrapper.rs
@@ -1124,6 +1124,10 @@ impl<'le> TElement for GeckoElement<'le> {
     where
         F: FnMut(&Atom),
     {
+        if !self.may_have_class() {
+            return;
+        }
+
         snapshot_helpers::each_class(self.0, callback, Gecko_ClassOrClassList)
     }