diff --git a/.travis/before_install.sh b/.travis/before_install.sh
index f5e2ae1e5..e4bf80be5 100755
--- a/.travis/before_install.sh
+++ b/.travis/before_install.sh
@@ -39,7 +39,7 @@ set -x
 cd /tmp || die
 
 [ $TRAVIS_OS_NAME != linux ] || {
-    (cd /etc/apt/sources.list.d && sudo rm -rf cassandra.list* couchdb.list* mongodb-3.4.list* rabbitmq_rabbitmq-server.list* chris-lea-redis-server.list* github_git-lfs.list*)
+    (cd /etc/apt/sources.list.d && sudo rm -rf cassandra.list* couchdb.list* mongodb-3.4.list* rabbitmq_rabbitmq-server.list* chris-lea-redis-server.list* github_git-lfs.list* pgdg.list)
     sudo apt-get update || die
 
     [ $BUILD_TARGET != posix-distcheck -a $BUILD_TARGET != posix-32-bit -a $BUILD_TARGET != posix-app-cli -a $BUILD_TARGET != posix-mtd -a $BUILD_TARGET != posix-ncp -a $BUILD_TARGET != posix-app-ncp ] || {