diff --git a/.travis.yml b/.travis.yml
index 4951fe64..f8a3de6f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -34,7 +34,7 @@ script:
   - docker run -v $PWD:/usr/src/i3/ -w /usr/src/i3 ${BASENAME} ./travis/check-formatting.sh
   - docker run -v $PWD:/usr/src/i3/ -w /usr/src/i3 -e CC -e CFLAGS="-Wformat -Wformat-security -Wextra -Wno-unused-parameter -Werror" ${BASENAME} make all mans -j ASAN=1
   - docker run -v $PWD:/usr/src/i3/ -w /usr/src/i3 ${BASENAME} ./travis/check-spelling.pl
-  - docker run -v $PWD:/usr/src/i3/ -w /usr/src/i3 ${BASENAME} ./travis/run-tests.sh
+  - docker run -v $PWD:/usr/src/i3/ -w /usr/src/i3 -e CC ${BASENAME} ./travis/run-tests.sh
   - ./travis/skip-pkg.sh || docker run -v $PWD:/usr/src/i3/ -w /usr/src/i3 ${BASENAME} ./travis/debian-build.sh deb/debian-amd64/DIST
   - ./travis/skip-pkg.sh || docker run -v $PWD:/usr/src/i3/ -w /usr/src/i3 ${BASENAME_UBUNTU} ./travis/debian-build.sh deb/ubuntu-amd64/DIST
   - ./travis/skip-pkg.sh || docker run -v $PWD:/usr/src/i3/ -w /usr/src/i3 ${BASENAME_386} linux32 ./travis/debian-build.sh deb/debian-i386/DIST