Index: lib/sanitizer_common/sanitizer_win.cc
===================================================================
--- lib/sanitizer_common/sanitizer_win.cc
+++ lib/sanitizer_common/sanitizer_win.cc
@@ -506,7 +506,18 @@
 }
 
 u64 MonotonicNanoTime() {
-  return 0;
+  static LARGE_INTEGER base, frequency = {0};
+  LARGE_INTEGER current, ns;
+  if (UNLIKELY(frequency.QuadPart == 0)) {
+    QueryPerformanceFrequency(&frequency);
+    QueryPerformanceCounter(&base);
+    CHECK_NE(frequency.QuadPart, 0);
+  }
+  QueryPerformanceCounter(&current);
+  ns.QuadPart = current.QuadPart - base.QuadPart;
+  ns.QuadPart *= 1000U * 1000000U;
+  ns.QuadPart /= frequency.QuadPart;
+  return ns.QuadPart;
 }
 
 void Abort() {