Index: lib/sanitizer_common/sanitizer_win.cc
===================================================================
--- lib/sanitizer_common/sanitizer_win.cc
+++ lib/sanitizer_common/sanitizer_win.cc
@@ -249,7 +249,7 @@
   void* addr_as_void = reinterpret_cast<void*>(addr);
   uptr base_as_uptr = reinterpret_cast<uptr>(base_);
   // Only unmap if it covers the entire range.
-  CHECK((addr_as_void == base_) && (size == size_));
+  CHECK((addr == base_as_uptr) && (size == size_));
   UnmapOrDie(reinterpret_cast<void*>(addr), size);
 }