add missing dist

diff --git a/.travis.yml b/.travis.yml
index db36768848c46873a6877d578b95a49805a30fc6..9a28e5b7182dcd7b5bdbdd11ebe69af03e6c9578 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -43,7 +43,7 @@ matrix:
             - clang-5.0\r
       env: MATRIX_EVAL="CC=clang-5.0 && CXX=clang++-5.0"\r
     - os: linux\r
-      dist: \r
+      dist: xenial\r
       compiler: clang\r
       addons:\r
         apt:\r