diff --git a/Lib/test/support/__init__.py b/Lib/test/support/__init__.py
index 19701cf388fe4e3..ed0d46de6426d61 100644
--- a/Lib/test/support/__init__.py
+++ b/Lib/test/support/__init__.py
@@ -1426,6 +1426,9 @@ def transient_internet(resource_name, *, timeout=30.0, errnos=()):
         ('EHOSTUNREACH', 113),
         ('ENETUNREACH', 101),
         ('ETIMEDOUT', 110),
+        # socket.create_connection() fails randomly with
+        # EADDRNOTAVAIL on Travis CI.
+        ('EADDRNOTAVAIL', 99),
     ]
     default_gai_errnos = [
         ('EAI_AGAIN', -3),