diff --git a/inflate.c b/inflate.c
index ac333e8c2eda..69b769a871b8 100644
--- a/third_party/zlib/inflate.c
+++ b/third_party/zlib/inflate.c
@@ -228,6 +228,7 @@ int stream_size;
     state->strm = strm;
     state->window = Z_NULL;
     state->mode = HEAD;     /* to pass state test in inflateReset2() */
+    state->check = adler32(0L, Z_NULL, 0);
     ret = inflateReset2(strm, windowBits);
     if (ret != Z_OK) {
         ZFREE(strm, state);