diff --git a/src/bitcoin-tx.cpp b/src/bitcoin-tx.cpp
--- a/src/bitcoin-tx.cpp
+++ b/src/bitcoin-tx.cpp
@@ -378,8 +378,8 @@
         throw std::runtime_error("incorrect number of multisig pubkeys");
     }
 
-    if (required < 1 || required > 20 || numkeys < 1 || numkeys > 20 ||
-        numkeys < required) {
+    if (required < 1 || required > MAX_PUBKEYS_PER_MULTISIG || numkeys < 1 ||
+        numkeys > MAX_PUBKEYS_PER_MULTISIG || numkeys < required) {
         throw std::runtime_error("multisig parameter mismatch. Required " +
                                  std::to_string(required) + " of " +
                                  std::to_string(numkeys) + "signatures.");