diff --git a/xzlib.c b/xzlib.c
index 782957f6..f43632bd 100644
--- a/xzlib.c
+++ b/xzlib.c
@@ -408,7 +408,7 @@ xz_head(xz_statep state)
         state->strm = init;
         state->strm.avail_in = 0;
         state->strm.next_in = NULL;
-        if (lzma_auto_decoder(&state->strm, UINT64_MAX, 0) != LZMA_OK) {
+        if (lzma_auto_decoder(&state->strm, 100000000, 0) != LZMA_OK) {
             xmlFree(state->out);
             xmlFree(state->in);
             state->size = 0;