diff --git a/.travis.yml b/.travis.yml
index de77e726..3f2bdf30 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -62,13 +62,18 @@ matrix:
       compiler: clang
     # osx with gcc6
     - os: osx
+      compiler: gcc
       env:
         - MATRIX_EVAL="brew install gcc6 && CC=gcc-6 && CXX=g++-7"
     # osx with gcc7
     - os: osx
+      compiler: gcc
+      env:
         - MATRIX_EVAL="brew install gcc7 && CC=gcc-7 && CXX=g++-7"
     # osx with gcc8
     - os: osx
+      compiler: gcc
+      env:
         - MATRIX_EVAL="brew install gcc8 && CC=gcc-8 && CXX=g++-8"
     # osx with xcode8.3/clang
     - os: osx