diff --git a/.travis.yml b/.travis.yml
index b7099c24..80406064 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,7 +10,7 @@ addons:
 matrix:
   include:
     # Ubuntu 14.04
-    - env: Cmd='make gcc6install && CC=gcc-6 make -j all && make clean && CC=gcc-6 make clean uasan-test-zstd'
+    - env: Cmd='make gcc6install && CC=gcc-6 make -j all && make clean && CC=gcc-6 make clean uasan-test-zstd </dev/null' # also test when stdin is not a tty
     - env: Cmd='make gcc6install libc6install && CC=gcc-6 make clean uasan-test-zstd32'
     - env: Cmd='make gcc7install && CC=gcc-7 make clean uasan-test-zstd'
     - env: Cmd='make clang38install && CC=clang-3.8 make clean msan-test-zstd'