diff --git a/libcxx/src/new.cpp b/libcxx/src/new.cpp
--- a/libcxx/src/new.cpp
+++ b/libcxx/src/new.cpp
@@ -55,7 +55,10 @@
 
 #if !defined(__GLIBCXX__) &&                                                   \
     !defined(_LIBCPP_ABI_VCRUNTIME) &&      \
-    !defined(_LIBCPP_DISABLE_NEW_DELETE_DEFINITIONS)
+    !defined(_LIBCPP_DISABLE_NEW_DELETE_DEFINITIONS) && \
+    !__has_feature(address_sanitizer) && \
+    !__has_feature(hwaddress_sanitizer) && \
+    !__has_feature(thread_sanitizer)
 
 // Implement all new and delete operators as weak definitions
 // in this shared library, so that they can be overridden by programs
diff --git a/libcxxabi/src/stdlib_new_delete.cpp b/libcxxabi/src/stdlib_new_delete.cpp
--- a/libcxxabi/src/stdlib_new_delete.cpp
+++ b/libcxxabi/src/stdlib_new_delete.cpp
@@ -17,6 +17,11 @@
 #error The _THROW_BAD_ALLOC, _NOEXCEPT, and _LIBCXXABI_WEAK libc++ macros must \
        already be defined by libc++.
 #endif
+
+#if !__has_feature(address_sanitizer) && \
+    !__has_feature(hwaddress_sanitizer) && \
+    !__has_feature(thread_sanitizer)
+
 // Implement all new and delete operators as weak definitions
 // in this shared library, so that they can be overridden by programs
 // that define non-weak copies of the functions.
@@ -259,4 +264,6 @@
     ::operator delete[](ptr, alignment);
 }
 
+#endif
+
 #endif // !_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION