diff --git a/misc-utils/lsblk-mnt.c b/misc-utils/lsblk-mnt.c
index bd015dc5a..5635073b0 100644
--- a/misc-utils/lsblk-mnt.c
+++ b/misc-utils/lsblk-mnt.c
@@ -60,7 +60,8 @@ static void add_filesystem(struct lsblk_device *dev, struct libmnt_fs *fs)
 	assert(dev);
 	assert(fs);
 
-	dev->fss = xrealloc(dev->fss, dev->nfss + 1 * sizeof(struct libmnt_fs *));
+	dev->fss = xrealloc(dev->fss, (dev->nfss + 1)
+					* sizeof(struct libmnt_fs *));
 	dev->fss[dev->nfss] = fs;
 	dev->nfss++;
 	dev->is_mounted = 1;