diff --git a/.travis.yml b/.travis.yml
index b7ebd40..091babd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -189,6 +189,7 @@ jobs:
     - { os: "linux", env: [ "B2_TOOLSET=clang-6.0",   "B2_CXXSTD=14,17"    ], addons: *clang-6   }
     - { 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: [ "B2_TOOLSET=clang-9",     "B2_CXXSTD=17"    ], addons: *clang-9   }
 
     # libc++
     - { os: "linux", env: [ "B2_TOOLSET=clang-6.0",   "B2_CXXSTD=11,14",
@@ -239,6 +240,7 @@ jobs:
     - { os: "linux", env: [ "COMMENT=STANDALONE",       "B2_TOOLSET=clang-6.0",   "B2_DEFINES=define=BOOST_STATIC_STRING_STANDALONE",       "B2_CXXSTD=17"    ], addons: *clang-6   }
     - { os: "linux", env: [ "COMMENT=STANDALONE",       "B2_TOOLSET=clang-7",     "B2_DEFINES=define=BOOST_STATIC_STRING_STANDALONE",       "B2_CXXSTD=17"    ], addons: *clang-7   }
     - { os: "linux", env: [ "COMMENT=STANDALONE",       "B2_TOOLSET=clang-8",     "B2_DEFINES=define=BOOST_STATIC_STRING_STANDALONE",       "B2_CXXSTD=17"    ], addons: *clang-8   }
+    - { os: "linux", env: [ "COMMENT=STANDALONE",       "B2_TOOLSET=clang-9",     "B2_DEFINES=define=BOOST_STATIC_STRING_STANDALONE",       "B2_CXXSTD=17"    ], addons: *clang-9   }
     - { os: "osx"  , env: [ "COMMENT=STANDALONE",       "B2_TOOLSET=clang",       "B2_DEFINES=define=BOOST_STATIC_STRING_STANDALONE",       "B2_CXXSTD=17"    ]                     }
         
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