diff --git a/mapfile.c b/mapfile.c
index 8d7acb3..6b2207d 100644
--- a/mapfile.c
+++ b/mapfile.c
@@ -215,7 +215,7 @@ void map_free(struct map_ent *map)
 }
 
 int map_update(struct map_ent **mpp, char *devnm, char *metadata,
-	       int *uuid, char *path)
+	       int uuid[4], char *path)
 {
 	struct map_ent *map, *mp;
 	int rv;
diff --git a/util.c b/util.c
index 5879694..cdf1da2 100644
--- a/util.c
+++ b/util.c
@@ -1543,7 +1543,7 @@ int open_container(int fd)
 	/* 'fd' is a block device.  Find out if it is in use
 	 * by a container, and return an open fd on that container.
 	 */
-	char path[256];
+	char path[288];
 	char *e;
 	DIR *dir;
 	struct dirent *de;