diff --git a/fuse_sideload.c b/fuse_sideload.c
index 4e11e01..1dd84e9 100644
--- a/fuse_sideload.c
+++ b/fuse_sideload.c
@@ -106,12 +106,12 @@
 
     vec[0].iov_base = &hdr;
     vec[0].iov_len = sizeof(hdr);
-    vec[1].iov_base = data;
+    vec[1].iov_base = /* const_cast */(void*)(data);
     vec[1].iov_len = len;
 
     res = writev(fd->ffd, vec, 2);
     if (res < 0) {
-        printf("*** REPLY FAILED *** %d\n", errno);
+        printf("*** REPLY FAILED *** %s\n", strerror(errno));
     }
 }
 
@@ -430,7 +430,7 @@
 
     char opts[256];
     snprintf(opts, sizeof(opts),
-             ("fd=%d,user_id=%d,group_id=%d,max_read=%zu,"
+             ("fd=%d,user_id=%d,group_id=%d,max_read=%u,"
               "allow_other,rootmode=040000"),
              fd.ffd, fd.uid, fd.gid, block_size);