diff --git a/libraries/stdlib/src/kotlin/dom/Dom.kt b/libraries/stdlib/src/kotlin/dom/Dom.kt
index b2d4e4066ab..fa9cefb499d 100644
--- a/libraries/stdlib/src/kotlin/dom/Dom.kt
+++ b/libraries/stdlib/src/kotlin/dom/Dom.kt
@@ -187,7 +187,7 @@ public fun Element.addClass(vararg cssClasses: String): Boolean {
 public fun Element.removeClass(vararg cssClasses: String): Boolean {
     if (cssClasses.any { hasClass(it) }) {
         val toBeRemoved = cssClasses.toSet()
-        classes = classes.trim().split("\\s+").filter { it !in toBeRemoved }.joinToString(" ")
+        classes = classes.trim().split("\\s+".toRegex()).filter { it !in toBeRemoved }.joinToString(" ")
         return true
     }