diff --git a/sbin/dumpfs/dumpfs.c b/sbin/dumpfs/dumpfs.c
index a899c9b35f88..34b06743427a 100644
--- a/sbin/dumpfs/dumpfs.c
+++ b/sbin/dumpfs/dumpfs.c
@@ -183,8 +183,8 @@ dumpfs(name)
 		    afs.fs_cssize - i : afs.fs_bsize;
 		afs.fs_csp[j] = calloc(1, size);
 		if (lseek(fd,
-		    (off_t)(fsbtodb(&afs, (afs.fs_csaddr + j * afs.fs_frag)) *
-		    dev_bsize), SEEK_SET) == (off_t)-1)
+		    (off_t)(fsbtodb(&afs, (afs.fs_csaddr + j * afs.fs_frag))) *
+		    (off_t)dev_bsize, SEEK_SET) == (off_t)-1)
 			goto err;
 		if (read(fd, afs.fs_csp[j], size) != size)
 			goto err;
@@ -225,8 +225,8 @@ dumpcg(name, fd, c)
 	int i, j;
 
 	printf("\ncg %d:\n", c);
-	if ((cur = lseek(fd, (off_t)(fsbtodb(&afs, cgtod(&afs, c)) * dev_bsize),
-	    SEEK_SET)) == (off_t)-1)
+	if ((cur = lseek(fd, (off_t)(fsbtodb(&afs, cgtod(&afs, c))) *
+	    (off_t)dev_bsize, SEEK_SET)) == (off_t)-1)
 		return (1);
 	if (read(fd, &acg, afs.fs_bsize) != afs.fs_bsize) {
 		(void)fprintf(stderr, "dumpfs: %s: error reading cg\n", name);