diff --git a/.travis.yml b/.travis.yml
index f0ccefb0e..150c75b3a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,12 +5,12 @@ rust:
 before_script:
   - rustup component add rustfmt
 addons:
-    apt:
-      sources:
-        - ubuntu-toolchain-r-test
-      packages:
-        - gcc-7
-        - g++-7
+  apt:
+    sources:
+      - ubuntu-toolchain-r-test
+    packages:
+      - gcc-7
+      - g++-7
 script:
   - export CC=gcc-7
   - export CXX=g++-7