diff --git a/_pytest/python.py b/_pytest/python.py
index a644807ce..6c7be14de 100644
--- a/_pytest/python.py
+++ b/_pytest/python.py
@@ -2541,10 +2541,10 @@ class FixtureDef:
         if what == 'SETUP':
             deps = sorted(arg for arg in self.argnames if arg != 'request')
             if deps:
-                tw.write(' (fixtures used: {})'.format(', '.join(deps)))
+                tw.write(' (fixtures used: {0})'.format(', '.join(deps)))
 
         if hasattr(self, 'cached_param'):
-            tw.write('[{}]'.format(self.cached_param))
+            tw.write('[{0}]'.format(self.cached_param))
 
         if capman:
             capman.resumecapture()
diff --git a/_pytest/runner.py b/_pytest/runner.py
index 1d3ae78ab..d385027ad 100644
--- a/_pytest/runner.py
+++ b/_pytest/runner.py
@@ -91,10 +91,10 @@ def show_test_item(item):
     tw = item.config.get_terminal_writer()
     tw.line()
     tw.write(' ' * 8)
-    tw.write('{}'.format(item._nodeid))
+    tw.write('{0}'.format(item._nodeid))
     used_fixtures = sorted(item._fixtureinfo.name2fixturedefs.keys())
     if used_fixtures:
-        tw.write(' (fixtures used: {})'.format(', '.join(used_fixtures)))
+        tw.write(' (fixtures used: {0})'.format(', '.join(used_fixtures)))
 
 def pytest_runtest_setup(item):
     item.session._setupstate.prepare(item)