diff --git a/caimira/tests/apps/calculator/test_webapp.py b/caimira/tests/apps/calculator/test_webapp.py
index 32d22352..32811e56 100644
--- a/caimira/tests/apps/calculator/test_webapp.py
+++ b/caimira/tests/apps/calculator/test_webapp.py
@@ -1,4 +1,5 @@
 from pathlib import Path
+import os
 
 import pytest
 import tornado.testing
@@ -7,7 +8,7 @@
 import caimira.apps.calculator
 from caimira.apps.calculator.report_generator import generate_permalink
 
-_TIMEOUT = 20.
+_TIMEOUT = int(os.environ.get('TIMEOUT_S', '20'))  # seconds
 
 
 @pytest.fixture