diff --git a/include/bitcoin/explorer/commands/validate-tx.hpp b/include/bitcoin/explorer/commands/validate-tx.hpp
index 34289f328..3202ab846 100644
--- a/include/bitcoin/explorer/commands/validate-tx.hpp
+++ b/include/bitcoin/explorer/commands/validate-tx.hpp
@@ -74,8 +74,6 @@ namespace commands {
  */
 #define BX_VALIDATE_TX_VALID \
     "The transaction is valid."
-#define BX_VALIDATE_TX_INVALID_INPUT \
-    "The transaction has an invalid input at index: %1%."
 #define BX_VALIDATE_TX_UNCONFIRMED_INPUTS \
     "The transaction is valid, with unconfirmed inputs at index: %1%."
 
diff --git a/model/generate.xml b/model/generate.xml
index 30942d20f..055f083e5 100644
--- a/model/generate.xml
+++ b/model/generate.xml
@@ -556,7 +556,6 @@
   <command symbol="validate-tx" formerly="validtx" output="string" category="ONLINE" network="true" description="Determine if a transaction is valid for submission to the blockchain. Requires a Libbitcoin/Obelisk server connection.">
     <argument name="TRANSACTION" fileX="true" stdin="true" type="transaction" description="The Base16 transaction. If not specified the transaction is read from STDIN."/>
     <define name="BX_VALIDATE_TX_VALID" value="The transaction is valid." />
-    <define name="BX_VALIDATE_TX_INVALID_INPUT" value="The transaction has an invalid input at index: %1%." />
     <define name="BX_VALIDATE_TX_UNCONFIRMED_INPUTS" value="The transaction is valid, with unconfirmed inputs at index: %1%." />
   </command>