diff --git a/sys/kern/subr_devstat.c b/sys/kern/subr_devstat.c
--- a/sys/kern/subr_devstat.c
+++ b/sys/kern/subr_devstat.c
@@ -430,6 +430,7 @@
 			struct devstat32 ds32;
 			unsigned int i;
 
+			memset(&ds32, 0, sizeof(ds32));
 			CP(*nds, ds32, sequence0);
 			CP(*nds, ds32, allocated);
 			CP(*nds, ds32, start_count);