diff --git a/plugins/inputs/disk/disk.go b/plugins/inputs/disk/disk.go
index 86aefc60f..b2c7e5400 100644
--- a/plugins/inputs/disk/disk.go
+++ b/plugins/inputs/disk/disk.go
@@ -13,9 +13,9 @@ type DiskStats struct {
 	ps system.PS
 
 	// Legacy support
-	Mountpoints []string
+	Mountpoints []string `toml:"mountpoints"`
 
-	MountPoints []string
+	MountPoints []string `toml:"mount_points"`
 	IgnoreFS    []string `toml:"ignore_fs"`
 }