diff --git a/.travis.yml b/.travis.yml
index eb3f2fc4..28d0f985 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -54,7 +54,6 @@ matrix:
 
 before_install:
   - if [ "${TRAVIS_OS_NAME}" == "linux" ]; then
-      export ASE_CALCULATORS='';
       export CONTAINER="${VARIANT}_${VERSION}_python${PYTHON}";
       docker pull "${VARIANT}:${VERSION}";
       docker run -dit --name "${CONTAINER}" -v "$TRAVIS_BUILD_DIR":/"$TRAVIS_BUILD_DIR" "${VARIANT}:${VERSION}" sh;