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1diff --git a/third_party/zlib/deflate.c b/third_party/zlib/deflate.c
2index a39e62787862..c6053fd1c7ea 100644
3--- a/third_party/zlib/deflate.c
4+++ b/third_party/zlib/deflate.c
5@@ -318,6 +318,10 @@ int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
6                                  s->w_size + window_padding,
7                                  2*sizeof(Byte));
8     s->prev   = (Posf *)  ZALLOC(strm, s->w_size, sizeof(Pos));
9+    /* Avoid use of uninitialized value, see:
10+     * https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=11360
11+     */
12+    zmemzero(s->prev, s->w_size * sizeof(Pos));
13     s->head   = (Posf *)  ZALLOC(strm, s->hash_size, sizeof(Pos));
14
15     s->high_water = 0;      /* nothing written to s->window yet */
16