diff --git a/py/h2o.py b/py/h2o.py
index <HASH>..<HASH> 100644
--- a/py/h2o.py
+++ b/py/h2o.py
@@ -520,7 +520,8 @@ def check_sandbox_for_errors(sandbox_ignore_errors=False):
                     # don't detect these class loader info messags as errors
                     #[Loaded java.lang.Error from /usr/lib/jvm/java-7-oracle/jre/lib/rt.jar]
                     foundBad = regex1.search(line) and not (
-                        ('error rate' in line) or ('[Loaded ' in line) or ('[WARN]' in line))
+                        ('error rate' in line) or ('[Loaded ' in line) or
+                        ('[WARN]' in line) or ('CalcSquareErrorsTasks' in line))
 
                 if (printing==0 and foundBad):
                     printing = 1
Log line containg reference to the class CalcSquareErrorsTasks causes
false test fail.