diff --git a/test/std/experimental/language.support/support.coroutines/end.to.end/bool_await_suspend.pass.cpp b/test/std/experimental/language.support/support.coroutines/end.to.end/bool_await_suspend.pass.cpp
index 9c3becffc..60b085489 100644
--- a/test/std/experimental/language.support/support.coroutines/end.to.end/bool_await_suspend.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/end.to.end/bool_await_suspend.pass.cpp
@@ -10,6 +10,9 @@
 
 // UNSUPPORTED: c++98, c++03, c++11
 
+// See https://bugs.llvm.org/show_bug.cgi?id=33271
+// UNSUPPORTED: ubsan
+
 #include <experimental/coroutine>
 #include <cassert>
 
diff --git a/test/std/experimental/language.support/support.coroutines/end.to.end/generator.pass.cpp b/test/std/experimental/language.support/support.coroutines/end.to.end/generator.pass.cpp
index 9200fae91..c92e26184 100644
--- a/test/std/experimental/language.support/support.coroutines/end.to.end/generator.pass.cpp
+++ b/test/std/experimental/language.support/support.coroutines/end.to.end/generator.pass.cpp
@@ -10,6 +10,9 @@
 
 // UNSUPPORTED: c++98, c++03, c++11
 
+// See https://bugs.llvm.org/show_bug.cgi?id=33271
+// UNSUPPORTED: ubsan
+
 #include <experimental/coroutine>
 #include <vector>
 #include <cassert>