diff --git a/src/java/org/apache/poi/util/IOUtils.java b/src/java/org/apache/poi/util/IOUtils.java
index c6bf8bd2ef..523f7c7de9 100644
--- a/src/java/org/apache/poi/util/IOUtils.java
+++ b/src/java/org/apache/poi/util/IOUtils.java
@@ -166,7 +166,7 @@ public final class IOUtils {
         }
 
         if (len != Integer.MAX_VALUE && totalBytes < len) {
-            throw new EOFException("unexpected EOF");
+            throw new EOFException("unexpected EOF - expected len: "+len+" - actual len: "+totalBytes);
         }
 
         return baos.toByteArray();