diff --git a/code/key-to-address-ecc-example.py b/code/key-to-address-ecc-example.py
index 2a206535..72f958a1 100644
--- a/code/key-to-address-ecc-example.py
+++ b/code/key-to-address-ecc-example.py
@@ -35,7 +35,7 @@ print("Public Key (hex) is:", hex_encoded_public_key)
 # Compress public key, adjust prefix depending on whether y is even or odd
 (public_key_x, public_key_y) = public_key
 compressed_prefix = '02' if (public_key_y % 2) == 0 else '03'
-hex_compressed_public_key = compressed_prefix + bitcoin.encode(public_key_x, 16)
+hex_compressed_public_key = compressed_prefix + (bitcoin.encode(public_key_x, 16).zfill(64))
 print("Compressed Public Key (hex) is:", hex_compressed_public_key)
 
 # Generate bitcoin address from public key