diff --git a/.travis.yml b/.travis.yml
index 50dd833..0aaec7c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,19 +1,28 @@
 dist: xenial
 sudo: required
+language: c++
 matrix:
   include:
-    - addons: {apt: {packages: ["g++-8"]}}
-      env: {MATRIX_EVAL: "CC=gcc-7 && CXX=g++-7"}
-    - addons: {apt: {packages: ["g++-8"]}}
-      env: {MATRIX_EVAL: "CC=gcc-8 && CXX=g++-8"}
-addons:
-  apt:
-    update: true
-    sources:
-      - ubuntu-toolchain-r-test
-    packages:
-      - libxdo-dev
-      - libinput-tools
+    - env: {MATRIX_EVAL: "CC=gcc-7 && CXX=g++-7"}
+      addons:
+        apt:
+          update: true
+          sources:
+            - "ubuntu-toolchain-r-test"
+          packages:
+            - libxdo-dev
+            - libinput-tools
+            - g++-7
+    - env: {MATRIX_EVAL: "CC=gcc-8 && CXX=g++-8"}
+      addons:
+        apt:
+          update: true
+          sources:
+            - "ubuntu-toolchain-r-test"
+          packages:
+            - libxdo-dev
+            - libinput-tools
+            - g++-8
 before_install: eval "${MATRIX_EVAL}"
 install: bash install
 script: ./tests/run_tests