diff --git a/lib/bcoin/script.js b/lib/bcoin/script.js
index 4c6ea27c..bf88b792 100644
--- a/lib/bcoin/script.js
+++ b/lib/bcoin/script.js
@@ -208,7 +208,7 @@ script.isMultisig = function isMultisig(s, key) {
   if (!key)
     return keys;
 
-  return keys.some(function(k) {
+  return m === keys.filter(function(k) {
     return utils.isEqual(k, key);
-  });
+  }).length;
 }