diff --git a/bip-taproot.mediawiki b/bip-taproot.mediawiki
index 298df189..b20dd093 100644
--- a/bip-taproot.mediawiki
+++ b/bip-taproot.mediawiki
@@ -254,7 +254,7 @@ This function returns the witness stack necessary and a <code>sighash</code> fun
 def taproot_sign_script(internal_pubkey, script_tree, script_num, inputs):
     info, h = taproot_tree_helper(script_tree)
     (leaf_version, script), path = info[script_num]
-    _, is_y_square = taproot_tweak_pubkey(internal_pubkey, t)
+    _, is_y_square = taproot_tweak_pubkey(internal_pubkey, h)
     output_pubkey_tag = 0 if is_y_square else 1
     pubkey_data = bytes([output_pubkey_tag + leaf_version]) + internal_pubkey
     return inputs + [script, pubkey_data + path]