diff --git a/.travis.yml b/.travis.yml
index 2230cba..fabaff7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,59 +2,62 @@ language: cpp
 matrix:
   include:
     - os: linux
-      env: IMAGE=ubuntu:rolling COMMAND=build_linux_gcc_coverall_ubuntu RELEASE_FILES=NONE
+      env: IMAGE=ubuntu:rolling COMMAND=build_linux_gcc_coverall_ubuntu
       services: docker
     - os: linux
-      env: IMAGE=i386/ubuntu:rolling COMMAND=build_linux_gcc_ubuntu_i386 RELEASE_FILES=NONE
+      env: IMAGE=i386/ubuntu:rolling COMMAND=build_linux_gcc_ubuntu_i386
       services: docker
     - os: linux
-      env: IMAGE=ubuntu:xenial COMMAND=build_linux_gcc_ubuntu RELEASE_FILES="build/sentencepiece*.{7z,rpm,deb}"
+      env: IMAGE=ubuntu:xenial COMMAND=build_linux_gcc_ubuntu RELEASE_FILES="$TRAVIS_BUILD_DIR/build/sentencepiece*.{7z,rpm,deb}"
       services: docker
     - os: linux
-      env: IMAGE=debian:stable COMMAND=build_linux_gcc_debian RELEASE_FILES=NONE
+      env: IMAGE=debian:stable COMMAND=build_linux_gcc_debian
       services: docker
     - os: linux
-      env: IMAGE=fedora:latest COMMAND=build_linux_gcc_fedora RELEASE_FILES=NONE
+      env: IMAGE=fedora:latest COMMAND=build_linux_gcc_fedora
       services: docker
     - os: linux
-      env: IMAGE=ubuntu:rolling COMMAND=build_linux_clang_ubuntu RELEASE_FILES=NONE
+      env: IMAGE=ubuntu:rolling COMMAND=build_linux_clang_ubuntu
       services: docker
     - os: linux
-      env: IMAGE=x86_64 COMMAND=make_py_wheel_py RELEASE_FILES="python/dist/*manylinux*.whl"
+      env: IMAGE=x86_64 COMMAND=make_py_wheel_py RELEASE_FILES="$TRAVIS_BUILD_DIR/python/dist/*manylinux*.whl"
       script:
         - $TRAVIS_BUILD_DIR/python/make_py_wheel.sh ${IMAGE}
       services: docker
     - os: linux
-      env: IMAGE=i686 COMMAND=make_py_wheel_py RELEASE_FILES="python/dist/*manylinux*.whl"
+      env: IMAGE=i686 COMMAND=make_py_wheel_py RELEASE_FILES="$TRAVIS_BUILD_DIR/python/dist/*manylinux*.whl"
       script:
         - $TRAVIS_BUILD_DIR/python/make_py_wheel.sh ${IMAGE}
       services: docker
     - os: linux
-      env: IMAGE=x86_64 COMMAND=make_py_wheel_tf RELEASE_FILES=NONE
+      env: IMAGE=x86_64 COMMAND=make_py_wheel_tf
       script:
-        - $TRAVIS_BUILD_DIR/tensorflow/make_py_wheel.sh RELEASE_FILES="python/dist/*.whl"
+        - $TRAVIS_BUILD_DIR/tensorflow/make_py_wheel.sh RELEASE_FILES="$TRAVIS_BUILD_DIR/python/dist/*.whl"
       services: docker
     - os: osx
       osx_image: xcode9.3
-      env: IMAGE=native COMMAND=build_osx RELEASE_FILES=NONE
+      env: IMAGE=native COMMAND=build_osx
     - os: osx
       osx_image: xcode9.4
-      env: IMAGE=native COMMAND=build_osx RELEASE_FILES=NONE
+      env: IMAGE=native COMMAND=build_osx
     - os: osx
       osx_image: xcode9.2
-      env: IMAGE=native COMMAND=build_osx RELEASE_FILES=NONE
+      env: IMAGE=native COMMAND=build_osx
     - os: osx
       osx_image: xcode9.4
-      env: IMAGE=native COMMAND=make_py_wheel_mac_py RELEASE_FILES="python/dist/delocated_wheel/*.whl"
+      env: IMAGE=native COMMAND=make_py_wheel_mac_py RELEASE_FILES="$TRAVIS_BUILD_DIR/python/dist/delocated_wheel/*.whl"
       script:
         - $TRAVIS_BUILD_DIR/python/make_py_wheel_mac.sh
     - os: osx
       osx_image: xcode9.4
-      env: IMAGE=native COMMAND=make_py_wheel_mac_tf RELEASE_FILES="python/dist/*.whl"
+      env: IMAGE=native COMMAND=make_py_wheel_mac_tf RELEASE_FILES="$TRAVIS_BUILD_DIR/python/dist/*.whl"
       script:
         - $TRAVIS_BUILD_DIR/tensorflow/make_py_wheel_mac.sh
 script:
   - $TRAVIS_BUILD_DIR/test.sh ${IMAGE} ${COMMAND}
+  - if [ -n "$RELEASE_FILES" ]; then
+      ls -l $RELEASE_FILES
+    fi
 deploy:
   provider: releases
   skip_cleanup: true
@@ -65,7 +68,7 @@ deploy:
   on:
     branch: master
     tags: true
-    condition: $RELEASE_FILES != NONE
+    condition: env(RELEASE_FILES) IS present
 env:
   global:
     secure: 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