diff --git a/.travis.yml b/.travis.yml
index 2b29dcb..6ebfe53 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -99,12 +99,7 @@ anchors:
                                            "libc6-dbg",
                                            "libc++-dev",
                                            "libstdc++-8-dev" ], sources: [ "llvm-toolchain-xenial-8",
-                                                                           "ubuntu-toolchain-r-test"   ] } }
-  clang-9:  &clang-9  { apt: { packages: [ "clang-9",
-                                           "libc6-dbg",
-                                           "libc++-dev",
-                                           "libstdc++-9-dev" ], sources: [ "llvm-toolchain-xenial-9",
-                                                                           "ubuntu-toolchain-r-test"   ] } }                                                                         
+                                                                           "ubuntu-toolchain-r-test"   ] } }                                                                       
     
   gcc-48:   &gcc-48   { apt: { packages: [ "g++-4.8"         ]                                           } }
   gcc-49:   &gcc-49   { apt: { packages: [ "g++-4.9"         ], sources: [ "ubuntu-toolchain-r-test"   ] } }
@@ -196,7 +191,7 @@ jobs:
     - { os: "linux", env: [ "B2_TOOLSET=clang-7",     "B2_CXXSTD=17"    ], addons: *clang-7   }
     - { os: "linux", env: [ "B2_TOOLSET=clang-8",     "B2_CXXSTD=17"    ], addons: *clang-8   }
     -   os: "linux"
-        env: ["COMMENT=STANDALONE", "B2_TOOLSET=clang-9", "B2_CXXST D=17", "B2_CXXFLAGS=-stdlib=libstdc++"]
+        env: ["B2_TOOLSET=clang-9", "B2_CXXST D=17", "B2_CXXFLAGS=-stdlib=libstdc++"]
         apt:
           sources:
             - ubuntu-toolchain-r-test