diff --git a/.travis.yml b/.travis.yml
index 0b1cd8d..00332db 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -316,7 +316,7 @@ matrix:
     - os: linux
       dist: bionic
       compiler: clang++-libc++
-      env: UBSAN=1 TOOLSET=clang CXXSTD=03,11,14,1z UBSAN_OPTIONS=print_stacktrace=1
+      env: UBSAN=1 TOOLSET=clang CXXSTD=03,11,14,17,2a UBSAN_OPTIONS=print_stacktrace=1
       addons:
         apt:
           packages: