diff --git a/third_party/marl/include/marl/sanitizers.h b/third_party/marl/include/marl/sanitizers.h
index 3f26d4a..aea997e 100644
--- a/third_party/marl/include/marl/sanitizers.h
+++ b/third_party/marl/include/marl/sanitizers.h
@@ -78,4 +78,13 @@
 #define THREAD_SANITIZER_ONLY(x)
 #endif  // THREAD_SANITIZER_ENABLED
 
+// The CLANG_NO_SANITIZE_MEMORY macro suppresses MemorySanitizer checks for
+// use-of-uninitialized-data. It can be used to decorate functions with known
+// false positives.
+#ifdef __clang__
+#define CLANG_NO_SANITIZE_MEMORY __attribute__((no_sanitize_memory))
+#else
+#define CLANG_NO_SANITIZE_MEMORY
+#endif
+
 #endif  // marl_sanitizers_h
diff --git a/third_party/marl/src/scheduler.cpp b/third_party/marl/src/scheduler.cpp
index 027565d..af98159 100644
--- a/third_party/marl/src/scheduler.cpp
+++ b/third_party/marl/src/scheduler.cpp
@@ -234,6 +234,9 @@
   MARL_ASSERT(worker != nullptr, "No Scheduler::Worker bound");
 }
 
+// TODO(chromium:1211047): Testing the static thread_local Worker::current for
+// null causes a MemorySantizer false positive.
+CLANG_NO_SANITIZE_MEMORY
 Scheduler::Fiber* Scheduler::Fiber::current() {
   auto worker = Worker::getCurrent();
   return worker != nullptr ? worker->getCurrentFiber() : nullptr;