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