diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..c5f8ef9
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,31 @@
+language: generic
+matrix:
+  include:
+  - os: linux
+    dist: xenial
+    sudo: required
+    language: cpp
+    compiler: gcc
+    addons:
+      apt:
+        sources:
+          - ubuntu-toolchain-r-test
+        packages:
+          - g++-8
+          - libatlas-base-dev
+          - libblas-dev
+  - os: osx
+    osx_image: xcode10.2
+    language: c++
+    compiler: clang
+
+before_install:
+  - |
+    [[ "${TRAVIS_OS_NAME}" == "linux" ]] && sudo ln -fs /usr/bin/gcc-8 /usr/local/bin/gcc; sudo ln -fs /usr/bin/g++-8 /usr/local/bin/g++;
+
+
+script:
+  - set -e
+  - |
+    ./configure --prefix=$PWD CXXFLAGS="-Werror"
+    make
diff --git a/src/hashtable_test.cc b/src/hashtable_test.cc
index 1a12509..7d09197 100644
--- a/src/hashtable_test.cc
+++ b/src/hashtable_test.cc
@@ -602,6 +602,7 @@ TYPED_TEST(HashtableIntTest, Typedefs) {
   // the type isn't used at all, and there's no good way to use the
   // variable.
   kt = this->ht_.deleted_key();
+  (void)kt;   // set but unused
   (void)vt;   // value_type may not be copyable.  Easiest not to try.
   h = this->ht_.hash_funct();
   ke = this->ht_.key_eq();