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-rw-r--r--tests/zlib/trees.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/tests/zlib/trees.c b/tests/zlib/trees.c
index 56e9bb1c..18be5013 100644
--- a/tests/zlib/trees.c
+++ b/tests/zlib/trees.c
@@ -722,7 +722,11 @@ local void scan_tree (s, tree, max_code)
int min_count = 4; /* min repeat count */
if (nextlen == 0) max_count = 138, min_count = 3;
+#ifndef EMSCRIPTEN_OPTS
tree[max_code+1].Len = (ush)0xffff; /* guard */
+#else
+ tree[max_code+1].Len = (ush)0x7fff; /* guard. Emscripten: Prevents llvm_gcc from creating '-1' which needs unsigning later */
+#endif
for (n = 0; n <= max_code; n++) {
curlen = nextlen; nextlen = tree[n+1].Len;