diff --git a/core/src/processing/data/FloatList.java b/core/src/processing/data/FloatList.java
index a22981a71..4c5022e7d 100644
--- a/core/src/processing/data/FloatList.java
+++ b/core/src/processing/data/FloatList.java
@@ -301,7 +301,7 @@ public class FloatList implements Iterable<Float> {
     if (index < 0) {
       throw new IllegalArgumentException("insert() index cannot be negative: it was " + index);
     }
-    if (index >= values.length) {
+    if (index >= data.length) {
       throw new IllegalArgumentException("insert() index " + index + " is past the end of this list");
     }
 
@@ -720,4 +720,4 @@ public class FloatList implements Iterable<Float> {
     sb.append(" ]");
     return sb.toString();
   }
-}
\ No newline at end of file
+}
diff --git a/core/src/processing/data/IntList.java b/core/src/processing/data/IntList.java
index 29c1de3c3..6caa9686c 100644
--- a/core/src/processing/data/IntList.java
+++ b/core/src/processing/data/IntList.java
@@ -255,7 +255,7 @@ public class IntList implements Iterable<Integer> {
     if (index < 0) {
       throw new IllegalArgumentException("insert() index cannot be negative: it was " + index);
     }
-    if (index >= values.length) {
+    if (index >= data.length) {
       throw new IllegalArgumentException("insert() index " + index + " is past the end of this list");
     }
 
@@ -725,4 +725,4 @@ public class IntList implements Iterable<Integer> {
     sb.append(" ]");
     return sb.toString();
   }
-}
\ No newline at end of file
+}