diff --git a/.travis.yml b/.travis.yml
index 005692d45..102c87353 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,8 +5,8 @@ env:
   matrix:
     - TASK=lint LINT_LANG=cpp
     - TASK=lint LINT_LANG=python
-    - TASK=R-package
-    - TASK=python-package
+    - TASK=R-package CXX=g++
+    - TASK=python-package CXX=g++
     - TASK=build CXX=g++
     - TASK=build-with-dmlc CXX=g++