diff --git a/compiler-rt/lib/memprof/memprof_allocator.h b/compiler-rt/lib/memprof/memprof_allocator.h
index 89e924f80d41a..6d898f06f7e42 100644
--- a/compiler-rt/lib/memprof/memprof_allocator.h
+++ b/compiler-rt/lib/memprof/memprof_allocator.h
@@ -46,11 +46,7 @@ struct MemprofMapUnmapCallback {
   void OnUnmap(uptr p, uptr size) const;
 };
 
-#if SANITIZER_APPLE
-constexpr uptr kAllocatorSpace = 0x600000000000ULL;
-#else
-constexpr uptr kAllocatorSpace = 0x500000000000ULL;
-#endif
+constexpr uptr kAllocatorSpace = ~(uptr)0;
 constexpr uptr kAllocatorSize = 0x40000000000ULL; // 4T.
 typedef DefaultSizeClassMap SizeClassMap;
 template <typename AddressSpaceViewTy>