1 files changed, 2 insertions, 1 deletions

diff --git a/gzread.c b/gzread.c
index 434ef023..548201ab 100644
--- a/gzread.c
+++ b/gzread.c
@@ -55,7 +55,8 @@ local int gz_avail(state)
     if (state->err != Z_OK)
         return -1;
     if (state->eof == 0) {
-        if (gz_load(state, state->in, state->size, &(strm->avail_in)) == -1)
+        if (gz_load(state, state->in, state->size,
+                (unsigned *)&(strm->avail_in)) == -1)
             return -1;
         strm->next_in = state->in;
     }