diff --git a/client/http.C b/client/http.C
index df33416fe3..ece3a879ef 100644
--- a/client/http.C
+++ b/client/http.C
@@ -824,7 +824,11 @@ bool HTTP_OP_SET::poll(double) {
                     htp->http_op_retval = 0;
                     if (htp->hrh.content_length) {
                         if ((htp->bytes_xferred-htp->file_offset) != htp->hrh.content_length) {
-							scope_messages.printf("HTTP_OP_SET::poll(): reply size: %d\n", htp->bytes_xferred-htp->file_offset);
+							scope_messages.printf(
+								"HTTP_OP_SET::poll(): ERR_IO: bytes transfred: %d,"
+								"file offset: %d, expected content length: %d\n",
+								htp->bytes_xferred, htp->file_offset, htp->hrh.content_length
+							);
                             htp->http_op_retval = ERR_IO;
                         }
                     }