diff --git a/src/_pytest/terminal.py b/src/_pytest/terminal.py
index c2d0d0ce1..fe3996238 100644
--- a/src/_pytest/terminal.py
+++ b/src/_pytest/terminal.py
@@ -851,7 +851,8 @@ class TerminalReporter(object):
                     msg = "ERROR collecting " + msg
                 elif rep.when == "setup":
                     msg = "ERROR at setup of " + msg
-                elif rep.when == "teardown":
+                else:
+                    assert rep.when == "teardown", "Unexpected rep: %r" % (rep,)
                     msg = "ERROR at teardown of " + msg
                 self.write_sep("_", msg, red=True, bold=True)
                 self._outrep_summary(rep)