diff --git a/scipy/conftest.py b/scipy/conftest.py

index e5fac23..1a971e8 100644

--- a/scipy/conftest.py

+++ b/scipy/conftest.py

@@ -37,3 +38,15 @@ def check_fpu_mode(request):

         warnings.warn("FPU mode changed from {0:#x} to {1:#x} during "

                       "the test".format(old_mode, new_mode),

                       category=FPUModeChangeWarning, stacklevel=0)

+

+

+ACCEPTABLE_FAILURE_RATE = int(os.environ.get('ACCEPTABLE_FAILURE_RATE', 0))

+

+

+@pytest.hookimpl()

+def pytest_sessionfinish(session, exitstatus):

+    if exitstatus != 1:

+        return

+    failure_rate = (100.0 * session.testsfailed) / session.testscollected

+    if failure_rate <= ACCEPTABLE_FAILURE_RATE:

+        session.exitstatus = 0