diff --git a/src/main/java/com/hivemq/client/internal/util/collections/ImmutableIntList.java b/src/main/java/com/hivemq/client/internal/util/collections/ImmutableIntList.java
index 2e6373415..846188aa9 100644
--- a/src/main/java/com/hivemq/client/internal/util/collections/ImmutableIntList.java
+++ b/src/main/java/com/hivemq/client/internal/util/collections/ImmutableIntList.java
@@ -47,8 +47,8 @@ public interface ImmutableIntList {
         Checks.notNull(others, "Int array");
         final int[] array = new int[3 + others.length];
         array[0] = i1;
-        array[0] = i2;
-        array[0] = i3;
+        array[1] = i2;
+        array[2] = i3;
         System.arraycopy(others, 0, array, 3, others.length);
         return new ImmutableIntArray(array);
     }
diff --git a/src/test/java/com/hivemq/client/internal/util/collections/ImmutableIntListTest.java b/src/test/java/com/hivemq/client/internal/util/collections/ImmutableIntListTest.java
index 26060539c..51571fd46 100644
--- a/src/test/java/com/hivemq/client/internal/util/collections/ImmutableIntListTest.java
+++ b/src/test/java/com/hivemq/client/internal/util/collections/ImmutableIntListTest.java
@@ -80,6 +80,15 @@ void of_single() {
         assertSame(ImmutableIntElement.class, built1.getClass());
     }
 
+    @Test
+    void of_four() {
+        final ImmutableIntList of4 = ImmutableIntList.of(1, 2, 3, 4);
+        assertEquals(1, of4.get(0));
+        assertEquals(2, of4.get(1));
+        assertEquals(3, of4.get(2));
+        assertEquals(4, of4.get(3));
+    }
+
     @Test
     void of_multiple() {
         final ImmutableIntList of1 = ImmutableIntList.of(1, 2);