diff --git a/.travis.yml b/.travis.yml
index 4bfde9e..3797ddf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -164,6 +164,10 @@ matrix:
     - os: linux
       compiler: clang++-libc++
       env: TOOLSET=clang COMPILER=clang++-libc++ CXXSTD=11,14,1z
+      addons:
+        apt:
+          packages:
+            - libc++-dev
 
     - os: osx
       compiler: clang++