diff --git a/lib/zlib/deflate.js b/lib/zlib/deflate.js
index 0c5fc1c..fe5f7c9 100644
--- a/lib/zlib/deflate.js
+++ b/lib/zlib/deflate.js
@@ -609,6 +609,9 @@ const deflate_stored = (s, flush) => {
     s.block_start = s.strstart;
     s.insert += used > s.w_size - s.insert ? s.w_size - s.insert : used;
   }
+  if (s.high_water < s.strstart) {
+    s.high_water = s.strstart;
+  }
 
   /* If the last block was written to next_out, then done. */
   if (last) {
@@ -641,6 +644,9 @@ const deflate_stored = (s, flush) => {
     read_buf(s.strm, s.window, s.strstart, have);
     s.strstart += have;
   }
+  if (s.high_water < s.strstart) {
+    s.high_water = s.strstart;
+  }
 
   /* There was not enough avail_out to write a complete worthy or flushed
    * stored block to next_out. Write a stored block to pending instead, if we