diff --git a/daemons/dmfilemapd/dmfilemapd.c b/daemons/dmfilemapd/dmfilemapd.c
index dd1db0344..225335c0b 100644
--- a/daemons/dmfilemapd/dmfilemapd.c
+++ b/daemons/dmfilemapd/dmfilemapd.c
@@ -55,7 +55,7 @@ struct filemap_monitor {
 
 	/* monitoring heuristics */
 	int64_t blocks; /* allocated blocks, from stat.st_blocks */
-	int64_t nr_regions;
+	uint64_t nr_regions;
 	int deleted;
 };