diff --git a/.travis.osx.yml b/.travis.osx.yml
index a990084f9..95c0e0598 100644
--- a/.travis.osx.yml
+++ b/.travis.osx.yml
@@ -4,18 +4,18 @@ env:
   # DROPBOX_KEY=[secure]
   - secure: "W8vou0KRJOOboZXP9q+D/9Wl6LlBeVS2T85MHWPz7EwCMQbJq5xWnGzYLE6FmC0iILcZkXyP63vqoYMFo5MJaEQeALGx2RuIiW7XgrD+7Bn4Vfsp6BLT7K9/AJETGGTQnLs8oZJJCXHGtzbc8EPFIZd/ZPPrve4jhEE5ZNhXnRc="
   matrix:
-  - CMAKE_CXX_COMPILER=g++-4.9 CMAKE_BUILD_TYPE=DEBUG   TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=51
-  - CMAKE_CXX_COMPILER=g++-4.9 CMAKE_BUILD_TYPE=RELEASE TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=51 UPLOAD=osx PACKAGE=TRUE
-  - CMAKE_CXX_COMPILER=g++-4.9 CMAKE_BUILD_TYPE=DEBUG   TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=52
-  - CMAKE_CXX_COMPILER=g++-4.9 CMAKE_BUILD_TYPE=RELEASE TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=52
-  - CMAKE_CXX_COMPILER=g++-4.9 CMAKE_BUILD_TYPE=DEBUg   TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=JIT
-  - CMAKE_CXX_COMPILER=g++-4.9 CMAKE_BUILD_TYPE=RELEASE TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=JIT
-  - CMAKE_CXX_COMPILER=clang++ CMAKE_BUILD_TYPE=DEBUG   TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=51
-  - CMAKE_CXX_COMPILER=clang++ CMAKE_BUILD_TYPE=RELEASE TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=51
-  - CMAKE_CXX_COMPILER=clang++ CMAKE_BUILD_TYPE=DEBUG   TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=52
-  - CMAKE_CXX_COMPILER=clang++ CMAKE_BUILD_TYPE=RELEASE TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=52
-  - CMAKE_CXX_COMPILER=clang++ CMAKE_BUILD_TYPE=DEBUG   TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=JIT
-  - CMAKE_CXX_COMPILER=clang++ CMAKE_BUILD_TYPE=RELEASE TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=JIT
+  - CMAKE_CXX_COMPILER=g++-4.9 CMAKE_BUILD_TYPE=DEBUG   TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=51  MULTI_THREAD=ON
+  - CMAKE_CXX_COMPILER=g++-4.9 CMAKE_BUILD_TYPE=RELEASE TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=51  MULTI_THREAD=ON UPLOAD=osx PACKAGE=TRUE
+  - CMAKE_CXX_COMPILER=g++-4.9 CMAKE_BUILD_TYPE=DEBUG   TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=52  MULTI_THREAD=ON
+  - CMAKE_CXX_COMPILER=g++-4.9 CMAKE_BUILD_TYPE=RELEASE TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=52  MULTI_THREAD=ON
+  - CMAKE_CXX_COMPILER=g++-4.9 CMAKE_BUILD_TYPE=DEBUG   TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=JIT MULTI_THREAD=ON
+  - CMAKE_CXX_COMPILER=g++-4.9 CMAKE_BUILD_TYPE=RELEASE TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=JIT MULTI_THREAD=ON
+  - CMAKE_CXX_COMPILER=clang++ CMAKE_BUILD_TYPE=DEBUG   TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=51  MULTI_THREAD=ON
+  - CMAKE_CXX_COMPILER=clang++ CMAKE_BUILD_TYPE=RELEASE TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=51  MULTI_THREAD=ON
+  - CMAKE_CXX_COMPILER=clang++ CMAKE_BUILD_TYPE=DEBUG   TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=52  MULTI_THREAD=ON
+  - CMAKE_CXX_COMPILER=clang++ CMAKE_BUILD_TYPE=RELEASE TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=52  MULTI_THREAD=ON
+  - CMAKE_CXX_COMPILER=clang++ CMAKE_BUILD_TYPE=DEBUG   TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=JIT MULTI_THREAD=ON
+  - CMAKE_CXX_COMPILER=clang++ CMAKE_BUILD_TYPE=RELEASE TCMALLOC=OFF PUSH_TO_CDASH=TRUE LUA=JIT MULTI_THREAD=ON
 
 # Turn off tcmalloc on OSX due to segmentation fault.
 # Soonho filed a bug report for this: