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-rwxr-xr-xci/before_script.sh2
1 files changed, 1 insertions, 1 deletions
diff --git a/ci/before_script.sh b/ci/before_script.sh
index 8bab1c4e17..701fe1d9eb 100755
--- a/ci/before_script.sh
+++ b/ci/before_script.sh
@@ -7,7 +7,7 @@ CI_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
source "${CI_DIR}/common/build.sh"
# Enable ipv6 on Travis. ref: a39c8b7ce30d
-if ! test "${TRAVIS_OS_NAME}" = osx ; then
+if test -n "${TRAVIS_OS_NAME}" && ! test "${TRAVIS_OS_NAME}" = osx ; then
echo "before_script.sh: enable ipv6"
sudo sysctl -w net.ipv6.conf.lo.disable_ipv6=0
fi