diff --git a/.travis.yml b/.travis.yml
index adfba74d..dd26b617 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,6 +5,7 @@
 sudo: required
 language: cpp
 
+# gcc 4.8
 addons: &gcc48
   apt:
     packages:
@@ -12,6 +13,7 @@ addons: &gcc48
     sources:
       - ubuntu-toolchain-r-test
 
+# gcc 7.0
 addons: &gcc7
   apt:
     packages:
@@ -19,6 +21,7 @@ addons: &gcc7
     sources:
       - ubuntu-toolchain-r-test
 
+# Clang 3.5
 addons: &clang35
   apt:
     packages:
@@ -26,6 +29,15 @@ addons: &clang35
     sources:
       - ubuntu-toolchain-r-test
       - llvm-toolchain-precise-3.5
+      
+# Clang 7.0
+addons: &clang70
+  apt:
+    packages:
+      - clang-7      
+    sources:
+      - ubuntu-toolchain-r-test
+      - llvm-toolchain-trusty-7
 
 
 
@@ -55,10 +67,12 @@ matrix:
 
       # Test clang-7.0: C++11, Build=Debug, ASAN=On
     - env: CLANG_VERSION=7.0 BUILD_TYPE=Debug CPP=11 ASAN=On TSAN=Off
-      os: linux      
+      os: linux   
+      addons: *clang70
 
     - env: CLANG_VERSION=7.0 BUILD_TYPE=Release CPP=11 ASAN=On TSAN=Off
-      os: linux      
+      os: linux
+      addons: *clang70
 
       # osx
     - env: BUILD_TYPE=Release CPP=11 ASAN=Off TSAN=Off
@@ -66,7 +80,6 @@ matrix:
 
 
 
-
 before_script:
   - if [ -n "$GCC_VERSION" ]; then export CXX="g++-${GCC_VERSION}" CC="gcc-${GCC_VERSION}"; fi
   - if [ -n "$CLANG_VERSION" ]; then export CXX="clang++-${CLANG_VERSION}" CC="clang-${CLANG_VERSION}"; fi