diff --git a/common/travis/environment.sh b/common/travis/environment.sh
index 503981867f..25c7f96981 100755
--- a/common/travis/environment.sh
+++ b/common/travis/environment.sh
@@ -1,8 +1,8 @@
 #!/bin/bash
 # Update compiler flags
-if [ "${CXX}" = "clang++" ]; then
+if [ "${CXX:0:7}" = "clang++" ]; then
   export CXXFLAGS="${CXXFLAGS} -Qunused-arguments"
-elif [ "${CXX}" = "g++" ]; then
+elif [ "${CXX:0:3}" = "g++" ]; then
   export CXX="g++-5"
   export CC="gcc-5"
 fi