diff --git a/.travis.yml b/.travis.yml
index 17b8b91..5855d9a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,7 +14,7 @@ matrix:
             - g++-4.9
             - cmake
             - cmake-data
-      env: COMPILER=g++-4.9
+      env: CXX_COMPILER=g++-4.9 C_COMPILER=g++-4.9
     - compiler: gcc
       addons:
         apt:
@@ -25,7 +25,7 @@ matrix:
             - g++-5
             - cmake
             - cmake-data
-      env: COMPILER=g++-5
+      env: CXX_COMPILER=g++-5 C_COMPILER=g++-5
     - compiler: clang
       addons:
         apt:
@@ -37,7 +37,7 @@ matrix:
             - clang-3.6
             - cmake
             - cmake-data
-      env: COMPILER=clang++-3.6
+      env: CXX_COMPILER=clang++-3.6 C_COMPILER=clang++-3.6
     - compiler: clang
       addons:
         apt:
@@ -49,7 +49,7 @@ matrix:
             - clang-3.7
             - cmake
             - cmake-data
-      env: COMPILER=clang++-3.7
+      env: CXX_COMPILER=clang++-3.7 C_COMPILER=clang++-3.7
 
 before_install:
   - sudo apt-get update -qq
@@ -57,4 +57,4 @@ before_install:
 script:
   - mkdir build
   - cd build
-  - cmake -DCMAKE_CXX_COMPILER=$COMPILER .. && make -j4 tests && ./tests/tests
\ No newline at end of file
+  - cmake -DCMAKE_CXX_COMPILER=$CXX_COMPILER -DCMAKE_C_COMPILER=$C_COMPILER .. && make -j4 tests && ./tests/tests
\ No newline at end of file