diff --git a/src/main/java/net/openhft/chronicle/bytes/internal/ChunkedMappedBytes.java b/src/main/java/net/openhft/chronicle/bytes/internal/ChunkedMappedBytes.java
index 272ea887fd6..8ba0f7af2a8 100644
--- a/src/main/java/net/openhft/chronicle/bytes/internal/ChunkedMappedBytes.java
+++ b/src/main/java/net/openhft/chronicle/bytes/internal/ChunkedMappedBytes.java
@@ -343,7 +343,7 @@ private BufferOverflowException writeBufferOverflowException0(final long offset)
             assert newBS.reservedBy(this);
 
         } catch (@NotNull IOException e) {
-            throw new IORuntimeException(e);
+            throw new IORuntimeException(String.format("Failed to acquireByteStore start: 0x%X offset: 0x%X safeLimit: 0x%X", start(), offset, safeLimit()), e);
         }
         if (set) {
             try {