diff --git a/libcxx/include/__assert b/libcxx/include/__assert
--- a/libcxx/include/__assert
+++ b/libcxx/include/__assert
@@ -41,7 +41,7 @@
 # define _LIBCPP_ASSERT(expression, message)                                        \
     (__builtin_expect(static_cast<bool>(expression), 1) ?                           \
       (void)0 :                                                                     \
-      _LIBCPP_VERBOSE_ABORT("%s:%d: assertion %s failed: %s", __FILE__, __LINE__, #expression, message))
+      _LIBCPP_VERBOSE_ABORT("%s:%d: assertion %s failed: %s", __builtin_FILE(), __builtin_FILE(), #expression, message))
 #elif !defined(_LIBCPP_ASSERTIONS_DISABLE_ASSUME) && __has_builtin(__builtin_assume)
 # define _LIBCPP_ASSERT(expression, message)                                        \
     (_LIBCPP_DIAGNOSTIC_PUSH                                                        \