diff --git a/.travis.yml b/.travis.yml
index 3f7156161..30c813ab3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -111,7 +111,7 @@ matrix:
           - llvm-toolchain-trusty-5.0
 
     - os: linux
-      env: COMPILER=clang++-5.0 VARIANT=ubsan_undefined TOOLSET=clang CXXSTD=c++11 UBSAN_OPTIONS='print_stacktrace=1'
+      env: COMPILER=clang++-5.0 VARIANT=ubsan_nullability TOOLSET=clang CXXSTD=c++11 UBSAN_OPTIONS='print_stacktrace=1'
       addons:
         apt:
           packages:
@@ -121,7 +121,7 @@ matrix:
           - llvm-toolchain-trusty-5.0
 
     - os: linux
-      env: COMPILER=clang++-5.0 VARIANT=ubsan_nullability TOOLSET=clang CXXSTD=c++11 UBSAN_OPTIONS='print_stacktrace=1'
+      env: COMPILER=clang++-5.0 VARIANT=ubsan_undefined TOOLSET=clang CXXSTD=c++11 UBSAN_OPTIONS='print_stacktrace=1'
       addons:
         apt:
           packages:
@@ -142,6 +142,9 @@ matrix:
           packages:
             - doxygen
 
+  allow_failures:
+    - env: COMPILER=clang++-5.0 VARIANT=ubsan_integer TOOLSET=clang CXXSTD=c++11 UBSAN_OPTIONS='print_stacktrace=1'
+
 install:
   - |-
     if [ "$DOC" ]; then