diff --git a/.travis.yml b/.travis.yml
index 1e52d56..3ffbb3f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,7 +11,9 @@ matrix:
             - ubuntu-toolchain-r-test
           packages:
             - g++-5
-      env: COMPILER=g++-5
+      env:
+        -CXX_COMPILER=g++-5
+        -C_COMPILER=gcc-5
     - compiler: clang
       addons:
         apt:
@@ -20,7 +22,9 @@ matrix:
             - llvm-toolchain-precise-3.6
           packages:
             - clang-3.6
-      env: COMPILER=clang++-3.6
+      env:
+        -CXX_COMPILER=clang++-3.6
+        -C_COMPILER=clang-3.6
     - compiler: clang
       addons:
         apt:
@@ -29,14 +33,16 @@ matrix:
             - llvm-toolchain-precise-3.7
           packages:
             - clang-3.7
-      env: COMPILER=clang++-3.7
+      env:
+        -CXX_COMPILER=clang++-3.7
+        -C_COMPILER=clang-3.7
 script:
   - mkdir build
   - cd build
   - cmake --version
   - source /opt/qt55/bin/qt55-env.sh
   - qmake -v
-  - cmake -DCMAKE_CXX_COMPILER=$COMPILER .. && make -j3
+  - cmake -DCMAKE_CXX_COMPILER=$CXX_COMPILER -DCMAKE_C_COMPILER=$C_COMPILER  . && make -j3
 before_install:
   - sudo add-apt-repository --yes ppa:beineri/opt-qt551-trusty
   - sudo apt-get update -qq