diff --git a/Testing/SystemTests/tests/analysis/ISIS_PowderPolarisTest.py b/Testing/SystemTests/tests/analysis/ISIS_PowderPolarisTest.py
index 609b60ac8b5f8ad6fd7f9a802a61bf86d1f1bb58..02db506284bbfbe5ab86a395f48feebd40afa6cf 100644
--- a/Testing/SystemTests/tests/analysis/ISIS_PowderPolarisTest.py
+++ b/Testing/SystemTests/tests/analysis/ISIS_PowderPolarisTest.py
@@ -72,6 +72,7 @@ class FocusTest(stresstesting.MantidStressTest):
 
     focus_results = None
     existing_config = config['datasearch.directories']
+    self.tolerance = 1e-13
 
     def requiredFiles(self):
         return _gen_required_files()