diff --git a/components/style/matching.rs b/components/style/matching.rs
index cf6da78bc19..37694bc0538 100644
--- a/components/style/matching.rs
+++ b/components/style/matching.rs
@@ -413,6 +413,15 @@ trait PrivateMatchMethods: TElement {
             }
         }
 
+        #[cfg(feature = "servo")]
+        {
+            // We may need to set or propagate the CAN_BE_FRAGMENTED bit
+            // on our children.
+            if old_values.is_multicol() != new_values.is_multicol() {
+                return ChildCascadeRequirement::MustCascadeChildren;
+            }
+        }
+
         // We could prove that, if our children don't inherit reset
         // properties, we can stop the cascade.
         ChildCascadeRequirement::MustCascadeChildrenIfInheritResetStyle