diff --git a/deflate.c b/deflate.c
index 4b804e6..10f1695 100644
--- a/deflate.c
+++ b/deflate.c
@@ -1635,7 +1635,8 @@ local block_state deflate_stored(deflate_state *s, int flush) {
      * possible. If flushing, copy the remaining available input to next_out as
      * stored blocks, if there is enough space.
      */
-    unsigned len, left, have, last = 0;
+    int last = 0;
+    unsigned len, left, have;
     unsigned used = s->strm->avail_in;
     do {
         /* Set len to the maximum size block that we can copy directly with the