diff --git a/sys/fs/tmpfs/tmpfs_vnops.c b/sys/fs/tmpfs/tmpfs_vnops.c
--- a/sys/fs/tmpfs/tmpfs_vnops.c
+++ b/sys/fs/tmpfs/tmpfs_vnops.c
@@ -1893,7 +1893,8 @@
 		TMPFS_UNLOCK(tmp);
 		return (false);
 	}
-	if (tmp->tm_ea_memory_inuse + size > tmp->tm_ea_memory_max) {
+	if ((int64_t)tmp->tm_ea_memory_inuse + size >
+	    (int64_t)tmp->tm_ea_memory_max) {
 		TMPFS_UNLOCK(tmp);
 		return (false);
 	}