diff --git a/.travis/before-install-linux-dotnet.sh b/.travis/before-install-linux-dotnet.sh
index bfe4eff76..816044f40 100755
--- a/.travis/before-install-linux-dotnet.sh
+++ b/.travis/before-install-linux-dotnet.sh
@@ -6,5 +6,5 @@ set -euo pipefail
 sudo sh -c 'echo "deb [arch=amd64] https://apt-mo.trafficmanager.net/repos/dotnet-release/ trusty main" > /etc/apt/sources.list.d/dotnetdev.list'
 sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 417A0893
 sudo apt-get update
-sudo apt-get install dotnet-dev-1.0.4
+sudo apt-get --allow-unauthenticated install dotnet-dev-1.0.4