Index: test/msan/mmap_below_shadow.cc
===================================================================
--- test/msan/mmap_below_shadow.cc
+++ test/msan/mmap_below_shadow.cc
@@ -15,7 +15,10 @@
 
 int main(void) {
   // Hint address just below shadow.
-#if defined(__x86_64__)
+#if defined(__FreeBSD__) && defined(__x86_64__)
+  uintptr_t hint = 0x0f0000000000ULL;
+  const uintptr_t app_start = 0x000000000000ULL;
+#elif defined(__x86_64__)
   uintptr_t hint = 0x4f0000000000ULL;
   const uintptr_t app_start = 0x600000000000ULL;
 #elif defined (__mips64)