diff --git a/test/fixtures/transaction_builder.json b/test/fixtures/transaction_builder.json
index aee7e90..abc850d 100644
--- a/test/fixtures/transaction_builder.json
+++ b/test/fixtures/transaction_builder.json
@@ -754,6 +754,30 @@
           }
         ]
       },
+      {
+        "description": "Wrong network for keyPair",
+        "exception": "Inconsistent network",
+        "network": "bitcoin",
+        "inputs": [
+          {
+            "txId": "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+            "vout": 0,
+            "signs": [
+              {
+                "keyPair": "91avARGdfge8E4tZfYLoxeJ5sGBdNJQH4kvjJoQFacbgwmaKkrx",
+                "network": "testnet",
+                "throws": true
+              }
+            ]
+          }
+        ],
+        "outputs": [
+          {
+            "script": "OP_DUP OP_HASH160 aa4d7985c57e011a8b3dd8e0e5a73aaef41629c5 OP_EQUALVERIFY OP_CHECKSIG",
+            "value": 1000
+          }
+        ]
+      },
       {
         "description": "Wrong key pair for multisig redeemScript",
         "exception": "key pair cannot sign for this input",
diff --git a/test/transaction_builder.js b/test/transaction_builder.js
index 7f5c7c9..a4048f5 100644
--- a/test/transaction_builder.js
+++ b/test/transaction_builder.js
@@ -195,7 +195,8 @@ describe('TransactionBuilder', function () {
 
         f.inputs.forEach(function (input, index) {
           input.signs.forEach(function (sign) {
-            var keyPair = ECPair.fromWIF(sign.keyPair, NETWORKS[f.network])
+            var keyPairNetwork = NETWORKS[sign.network || f.network]
+            var keyPair = ECPair.fromWIF(sign.keyPair, keyPairNetwork)
             var redeemScript
 
             if (sign.redeemScript) {