diff --git a/primitiveCollections/src/main/java/org/lucares/collections/IntList.java b/primitiveCollections/src/main/java/org/lucares/collections/IntList.java
index 02d7f82..d7baed0 100644
--- a/primitiveCollections/src/main/java/org/lucares/collections/IntList.java
+++ b/primitiveCollections/src/main/java/org/lucares/collections/IntList.java
@@ -158,12 +158,11 @@ public final class IntList implements Serializable, Cloneable {
 
 		ensureCapacity(values.length);
 
-		// TODO do not copy the array twice
-		final int[] newData = new int[data.length];
-		System.arraycopy(data, 0, newData, 0, pos);
-		System.arraycopy(values, 0, newData, pos, values.length);
-		System.arraycopy(data, pos, newData, pos + values.length, index - pos);
-		data = newData;
+		// move everything after the insert position to make room for the new values
+		System.arraycopy(data, pos, data, pos + values.length, values.length);
+		// insert the new values
+		System.arraycopy(values, 0, data, pos, values.length);
+
 		index += values.length;
 	}