diff --git a/lib/bcoin/script.js b/lib/bcoin/script.js
index e676a48b..b0af9f5f 100644
--- a/lib/bcoin/script.js
+++ b/lib/bcoin/script.js
@@ -1271,11 +1271,11 @@ Script.prototype.execute = function execute(stack, flags, tx, index, version) {
             val = Script.bool(stack.pop());
             if (op === opcodes.OP_NOTIF)
               val = !val;
-            state.push(val === true ? 1 : 0);
+            state.push(val);
             if (!val)
               negate++;
           } else {
-            state.push(0);
+            state.push(false);
             negate++;
           }
           break;
@@ -1283,8 +1283,8 @@ Script.prototype.execute = function execute(stack, flags, tx, index, version) {
         case opcodes.OP_ELSE: {
           if (state.length === 0)
             throw new ScriptError('UNBALANCED_CONDITIONAL', op, ip);
-          state[state.length - 1] ^= 1;
-          if (state[state.length - 1] === 0)
+          state[state.length - 1] = !state[state.length - 1];
+          if (!state[state.length - 1])
             negate++;
           else
             negate--;
@@ -1293,7 +1293,7 @@ Script.prototype.execute = function execute(stack, flags, tx, index, version) {
         case opcodes.OP_ENDIF: {
           if (state.length === 0)
             throw new ScriptError('UNBALANCED_CONDITIONAL', op, ip);
-          if (state.pop() === 0)
+          if (!state.pop())
             negate--;
           break;
         }