diff --git a/.travis.yml b/.travis.yml
index 6c6e4af..7e49bb5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,23 +5,26 @@ sudo: false
 matrix:
   include:
     - os: linux
-      addons:
-        apt:
-          packages: [ 'protobuf-compiler', 'libprotobuf-dev' ]
-    - os: linux
+      compiler: gcc
       env: COVERAGE=gcov-4.9 CXX=g++-4.9 CC=gcc-4.9
       addons:
         apt:
           sources: ['ubuntu-toolchain-r-test']
           packages: [ 'g++-4.9', 'protobuf-compiler', 'libprotobuf-dev' ]
+    - os: linux
+      compiler: clang
+      addons:
+        apt:
+          packages: [ 'protobuf-compiler', 'libprotobuf-dev' ]
     - os: osx
+      compiler: clang
 
 
 install:
  - if [[ $(uname -s) == 'Darwin' ]]; then brew install protobuf; fi;
  - if [ -n "${COVERAGE}" ]; then
-       export CXXFLAGS="--coverage";
-       export CFLAGS="--coverage";
+       export CXXFLAGS="--coverage -g";
+       export CFLAGS="--coverage -g";
        export LDFLAGS="--coverage";
    fi;
  - make
@@ -30,6 +33,7 @@ script:
  - echo '{"type":"Feature","properties":{},"geometry":{"type":"Point","coordinates":[0,0]}}' > test.json
  - ./tippecanoe -o test.mbtiles test.json
  - if [ -n "${COVERAGE}" ]; then
+       ls
        ${COVERAGE} -lp *.o;
        pip install --user cpp-coveralls;
        ~/.local/bin/coveralls --no-gcov -i ./;