diff --git a/tox.ini b/tox.ini
index 7b1c348cce..2c1ebfed0f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,6 +5,7 @@ skipsdist = True
 
 [testenv]
 setenv = VIRTUAL_ENV={envdir}
+         PYTHONWARNINGS=default::DeprecationWarning
          OS_TEST_PATH=heat/tests
          TESTR_START_DIR=heat/tests
 usedevelop = True