diff --git a/CoreBitcoin/BTCTransactionBuilder.m b/CoreBitcoin/BTCTransactionBuilder.m
index a92c7b0a..93309f92 100644
--- a/CoreBitcoin/BTCTransactionBuilder.m
+++ b/CoreBitcoin/BTCTransactionBuilder.m
@@ -32,7 +32,7 @@ - (id) init {
 
 - (BTCTransactionBuilderResult*) buildTransaction:(NSError**)errorOut {
     if (!self.changeScript) {
-        if (errorOut) *errorOut = [NSError errorWithDomain:BTCTransactionBuilderErrorDomain code:BTCTransactionBuilderInsufficientFunds userInfo:nil];
+        if (errorOut) *errorOut = [NSError errorWithDomain:BTCTransactionBuilderErrorDomain code:BTCTransactionBuilderChangeAddressMissing userInfo:nil];
         return nil;
     }