diff --git a/pipenv/core.py b/pipenv/core.py
index c30651cf69..74b72359df 100644
--- a/pipenv/core.py
+++ b/pipenv/core.py
@@ -432,7 +432,7 @@ def abort():
                         u"{0} {1} {2} {3}{4}".format(
                             crayons.normal(u"Installing", bold=True),
                             crayons.green(u"CPython {0}".format(version), bold=True),
-                            crayons.normal(u"with {}".format(installer), bold=True),
+                            crayons.normal(u"with {0}".format(installer), bold=True),
                             crayons.normal(u"(this may take a few minutes)"),
                             crayons.normal(fix_utf8("…"), bold=True),
                         )