diff --git a/src/dorkbox/collections/IntSet.kt b/src/dorkbox/collections/IntSet.kt
index 7e1b3e2..b462465 100644
--- a/src/dorkbox/collections/IntSet.kt
+++ b/src/dorkbox/collections/IntSet.kt
@@ -192,7 +192,7 @@ class IntSet: MutableSet<Int> {
     override fun addAll(elements: Collection<Int>): Boolean {
         var added = false
         elements.forEach {
-            added = added || add(it)
+            added = add(it) || added
         }
 
         return added
diff --git a/src/dorkbox/collections/ObjectSet.kt b/src/dorkbox/collections/ObjectSet.kt
index ea49602..4966e8e 100644
--- a/src/dorkbox/collections/ObjectSet.kt
+++ b/src/dorkbox/collections/ObjectSet.kt
@@ -182,7 +182,7 @@ open class ObjectSet<T: Any> : MutableSet<T> {
     override fun addAll(elements: Collection<T>): Boolean {
         var added = false
         elements.forEach {
-            added = added || add(it)
+            added = add(it) || added
         }
         return added
     }