diff --git a/block/src/vhdx/vhdx_header.rs b/block/src/vhdx/vhdx_header.rs
index b51dab1ce..ad86a2d6c 100644
--- a/block/src/vhdx/vhdx_header.rs
+++ b/block/src/vhdx/vhdx_header.rs
@@ -160,7 +160,7 @@ impl Header {
     }
 
     /// Creates and returns new updated header from the provided current header
-    pub fn update_header(
+    fn update_header(
         f: &mut File,
         current_header: &Header,
         change_data_guid: bool,