diff --git a/bitcoin/src/blockdata/block.rs b/bitcoin/src/blockdata/block.rs
index 38bb8a079..b58b02fc1 100644
--- a/bitcoin/src/blockdata/block.rs
+++ b/bitcoin/src/blockdata/block.rs
@@ -66,9 +66,16 @@ impl Header {
     pub const SIZE: usize = 4 + 32 + 32 + 4 + 4 + 4; // 80
 
     /// Returns the block hash.
+    // This is the same as `Encodable` but done manually because `Encodable` isn't in `primitives`.
     pub fn block_hash(&self) -> BlockHash {
         let mut engine = sha256d::Hash::engine();
-        self.consensus_encode(&mut engine).expect("engines don't error");
+        engine.input(&self.version.to_consensus().to_le_bytes());
+        engine.input(self.prev_blockhash.as_byte_array());
+        engine.input(self.merkle_root.as_byte_array());
+        engine.input(&self.time.to_le_bytes());
+        engine.input(&self.bits.to_consensus().to_le_bytes());
+        engine.input(&self.nonce.to_le_bytes());
+
         BlockHash::from_byte_array(sha256d::Hash::from_engine(engine).to_byte_array())
     }