diff --git a/.travis.yml b/.travis.yml
index ca7294b8..a9ae796b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,7 +8,7 @@ rust:
 addons:
   apt:
     packages:
-    - libstdc++6
+    - g++-4.9       # required to compile glslang
 
 script:
     - cargo test -v --manifest-path glsl-to-spirv/Cargo.toml