diff --git a/libs/host/CopyFile.c b/libs/host/CopyFile.c
index a822b41..98adcff 100644
--- a/libs/host/CopyFile.c
+++ b/libs/host/CopyFile.c
@@ -63,6 +63,22 @@
 }
 
 /*
+ * Returns true if the source file has high resolution modification
+ * date.  Cygwin doesn't support st_mtim in normal build, so always
+ * return false.
+ */
+static bool isHiresMtime(const struct stat* pSrcStat)
+{
+#ifdef WIN32_EXE
+    return 0;
+#elif defined(MACOSX_RSRC)
+    return pSrcStat->st_mtimespec.tv_nsec > 0;
+#else
+    return pSrcStat->st_mtim.tv_nsec > 0;
+#endif
+}
+
+/*
  * Returns true if the source and destination files are actually the
  * same thing.  We detect this by checking the inode numbers, which seems
  * to work on Cygwin.
@@ -151,6 +167,8 @@
          */
         ut.actime = pSrcStat->st_atime;
         ut.modtime = pSrcStat->st_mtime;
+        if (isHiresMtime(pSrcStat))
+            ut.modtime += 1;
         if (utime(dst, &ut) != 0) {
             DBUG(("---   unable to set timestamps on '%s': %s\n",
                 dst, strerror(errno)));