diff --git a/jctools-core/src/main/java/org/jctools/util/UnsafeRefArrayAccess.java b/jctools-core/src/main/java/org/jctools/util/UnsafeRefArrayAccess.java
index e9f26715..b959d340 100644
--- a/jctools-core/src/main/java/org/jctools/util/UnsafeRefArrayAccess.java
+++ b/jctools-core/src/main/java/org/jctools/util/UnsafeRefArrayAccess.java
@@ -48,7 +48,7 @@ else if (8 == scale)
         }
         else
         {
-            throw new IllegalStateException("Unknown pointer size");
+            throw new IllegalStateException("Unknown pointer size: " + scale);
         }
         REF_ARRAY_BASE = UnsafeAccess.UNSAFE.arrayBaseOffset(Object[].class);
     }