diff --git a/src/codechicken/lib/render/CCRenderState.java b/src/codechicken/lib/render/CCRenderState.java
index 0695e5c..9a10081 100644
--- a/src/codechicken/lib/render/CCRenderState.java
+++ b/src/codechicken/lib/render/CCRenderState.java
@@ -102,7 +102,7 @@ public class CCRenderState
 
     public static <T> T copyOf(VertexAttribute<T> attr, T src, int length) {
         T dst = attr.newArray(length);
-        arrayCopy(src, 0, dst, 0, length);
+        arrayCopy(src, 0, dst, 0, ((Object[])src).length);
         return dst;
     }