diff --git a/sys/geom/label/g_label_ufs.c b/sys/geom/label/g_label_ufs.c
--- a/sys/geom/label/g_label_ufs.c
+++ b/sys/geom/label/g_label_ufs.c
@@ -49,19 +49,8 @@
 #define	G_LABEL_UFS_ID		1
 
 /*
- * G_LABEL_UFS_CMP returns true if difference between provider mediasize
- * and filesystem size is less than G_LABEL_UFS_MAXDIFF sectors
- */
-#define	G_LABEL_UFS_CMP(prov, fsys, size) 				   \
-	( abs( ((fsys)->size) - ( (prov)->mediasize / (fsys)->fs_fsize ))  \
-				< G_LABEL_UFS_MAXDIFF )
-#define	G_LABEL_UFS_MAXDIFF	0x100
-
-/*
- * Try to find a superblock on the provider. If successful, then
- * check that the size in the superblock corresponds to the size
- * of the underlying provider. Finally, look for a volume label
- * and create an appropriate provider based on that.
+ * Try to find a superblock on the provider. If successful, look for a volume
+ * label and create an appropriate provider based on that.
  */
 static void
 g_label_ufs_taste_common(struct g_consumer *cp, char *label, size_t size, int what)
@@ -81,24 +70,10 @@
 		return;
 	}
 
-	/*
-	 * Check for magic. We also need to check if file system size
-	 * is almost equal to providers size, because sysinstall(8)
-	 * used to bogusly put first partition at offset 0
-	 * instead of 16, and glabel/ufs would find file system on slice
-	 * instead of partition.
-	 *
-	 * In addition, media size can be a bit bigger than file system
-	 * size. For instance, mkuzip can append bytes to align data
-	 * to large sector size (it improves compression rates).
-	 */
-	if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0 &&
-	    ( G_LABEL_UFS_CMP(pp, fs, fs_old_size)
-		|| G_LABEL_UFS_CMP(pp, fs, fs_providersize))) {
+	/* Check for magic. */
+	if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0) {
 		/* Valid UFS1. */
-	} else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0 &&
-	    ( G_LABEL_UFS_CMP(pp, fs, fs_size)
-		|| G_LABEL_UFS_CMP(pp, fs, fs_providersize))) {
+	} else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0) {
 		/* Valid UFS2. */
 	} else {
 		goto out;