diff --git a/tools/virtiofsd/fuse_common.h b/tools/virtiofsd/fuse_common.h
index 0c2665b977..6f8a988202 100644
--- a/tools/virtiofsd/fuse_common.h
+++ b/tools/virtiofsd/fuse_common.h
@@ -439,7 +439,7 @@ struct fuse_conn_info {
     /**
      * Capability flags that the kernel supports (read-only)
      */
-    unsigned capable;
+    uint64_t capable;
 
     /**
      * Capability flags that the filesystem wants to enable.
@@ -447,7 +447,7 @@ struct fuse_conn_info {
      * libfuse attempts to initialize this field with
      * reasonable default values before calling the init() handler.
      */
-    unsigned want;
+    uint64_t want;
 
     /**
      * Maximum number of pending "background" requests. A
diff --git a/tools/virtiofsd/fuse_lowlevel.c b/tools/virtiofsd/fuse_lowlevel.c
index 03d60f462a..794185fb33 100644
--- a/tools/virtiofsd/fuse_lowlevel.c
+++ b/tools/virtiofsd/fuse_lowlevel.c
@@ -2070,7 +2070,7 @@ static void do_init(fuse_req_t req, fuse_ino_t nodeid,
     if (se->conn.want & (~se->conn.capable)) {
         fuse_log(FUSE_LOG_ERR,
                  "fuse: error: filesystem requested capabilities "
-                 "0x%x that are not supported by kernel, aborting.\n",
+                 "0x%llx that are not supported by kernel, aborting.\n",
                  se->conn.want & (~se->conn.capable));
         fuse_reply_err(req, EPROTO);
         se->error = -EPROTO;