diff --git a/.travis.yml b/.travis.yml
index feb85676eb..9db482a01f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -47,7 +47,7 @@ jobs:
       dist: xenial
       go: 1.13.x
       script:
-        - export GODEBUG=netdns=go+1
+        - export GODEBUG=netdns=cgo
         - go run build/ci.go install
         - go run build/ci.go test -coverage $TEST_PACKAGES