diff --git a/.travis.yml b/.travis.yml
index 857c6469f..f1ddd240c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -36,15 +36,15 @@ matrix:
   - compiler: gcc
     os: linux
     env: GTSAM_BUILD_UNSTABLE=OFF GTSAM_BUILD_EXAMPLES_ALWAYS=OFF GTSAM_BUILD_TESTS=ON # gcc too slow for all tests
-  # - compiler: gcc
-  #   os: linux
-  #   env: GTSAM_BUILD_UNSTABLE=ON GTSAM_BUILD_EXAMPLES_ALWAYS=ON GTSAM_BUILD_TESTS=OFF GCC_VERSION="8"
-  # - compiler: clang
-  #   os: linux
-  #   env: GTSAM_BUILD_UNSTABLE=ON GTSAM_BUILD_EXAMPLES_ALWAYS=ON GTSAM_BUILD_TESTS=OFF
-  # - compiler: gcc
-  #   os: osx
-  #   env: GTSAM_BUILD_UNSTABLE=ON GTSAM_BUILD_EXAMPLES_ALWAYS=ON GTSAM_BUILD_TESTS=OFF
-  # - compiler: clang
-  #   os: osx
-  #   env: GTSAM_BUILD_UNSTABLE=ON GTSAM_BUILD_EXAMPLES_ALWAYS=OFF GTSAM_BUILD_TESTS=ON
+  - compiler: gcc
+    os: linux
+    env: GTSAM_BUILD_UNSTABLE=ON GTSAM_BUILD_EXAMPLES_ALWAYS=ON GTSAM_BUILD_TESTS=OFF GCC_VERSION="8"
+  - compiler: clang
+    os: linux
+    env: GTSAM_BUILD_UNSTABLE=ON GTSAM_BUILD_EXAMPLES_ALWAYS=ON GTSAM_BUILD_TESTS=OFF
+  - compiler: gcc
+    os: osx
+    env: GTSAM_BUILD_UNSTABLE=ON GTSAM_BUILD_EXAMPLES_ALWAYS=ON GTSAM_BUILD_TESTS=OFF
+  - compiler: clang
+    os: osx
+    env: GTSAM_BUILD_UNSTABLE=ON GTSAM_BUILD_EXAMPLES_ALWAYS=OFF GTSAM_BUILD_TESTS=ON