diff --git a/lib/grntest/reporters/benchmark-json-reporter.rb b/lib/grntest/reporters/benchmark-json-reporter.rb
index 5ffa1d4..645ac19 100644
--- a/lib/grntest/reporters/benchmark-json-reporter.rb
+++ b/lib/grntest/reporters/benchmark-json-reporter.rb
@@ -60,6 +60,12 @@ def on_test_success(worker, result)
       end
 
       def on_test_failure(worker, result)
+        output, @output = @output, $stderr
+        begin
+          report_failure(result)
+        ensure
+          @output = output
+        end
       end
 
       def on_test_leak(worker, result)