diff --git a/bitcoin/src/blockdata/block.rs b/bitcoin/src/blockdata/block.rs
index 2c19fd163..641f36475 100644
--- a/bitcoin/src/blockdata/block.rs
+++ b/bitcoin/src/blockdata/block.rs
@@ -73,11 +73,6 @@ crate::internal_macros::define_extension_trait! {
     }
 }
 
-mod sealed {
-    pub trait Sealed {}
-    impl Sealed for super::Header {}
-}
-
 impl Encodable for Version {
     fn consensus_encode<W: Write + ?Sized>(&self, w: &mut W) -> Result<usize, io::Error> {
         self.to_consensus().consensus_encode(w)
@@ -301,6 +296,11 @@ impl Decodable for Block {
     }
 }
 
+mod sealed {
+    pub trait Sealed {}
+    impl Sealed for super::Header {}
+}
+
 /// An error when looking up a BIP34 block height.
 #[derive(Debug, Clone, PartialEq, Eq)]
 #[non_exhaustive]