diff --git a/lib/bcoin/script.js b/lib/bcoin/script.js
index 813868da..e676a48b 100644
--- a/lib/bcoin/script.js
+++ b/lib/bcoin/script.js
@@ -1242,22 +1242,23 @@ Script.prototype.execute = function execute(stack, flags, tx, index, version) {
     // are in unexecuted branches of code_. Whereas
     // a totally unknown opcode is fine as long as it
     // is unexecuted.
-    if (op === opcodes.OP_CAT
-        || op === opcodes.OP_SUBSTR
-        || op === opcodes.OP_LEFT
-        || op === opcodes.OP_RIGHT
-        || op === opcodes.OP_INVERT
-        || op === opcodes.OP_AND
-        || op === opcodes.OP_OR
-        || op === opcodes.OP_XOR
-        || op === opcodes.OP_2MUL
-        || op === opcodes.OP_2DIV
-        || op === opcodes.OP_MUL
-        || op === opcodes.OP_DIV
-        || op === opcodes.OP_MOD
-        || op === opcodes.OP_LSHIFT
-        || op === opcodes.OP_RSHIFT) {
-      throw new ScriptError('DISABLED_OPCODE', op, ip);
+    switch (op) {
+      case opcodes.OP_CAT:
+      case opcodes.OP_SUBSTR:
+      case opcodes.OP_LEFT:
+      case opcodes.OP_RIGHT:
+      case opcodes.OP_INVERT:
+      case opcodes.OP_AND:
+      case opcodes.OP_OR:
+      case opcodes.OP_XOR:
+      case opcodes.OP_2MUL:
+      case opcodes.OP_2DIV:
+      case opcodes.OP_MUL:
+      case opcodes.OP_DIV:
+      case opcodes.OP_MOD:
+      case opcodes.OP_LSHIFT:
+      case opcodes.OP_RSHIFT:
+        throw new ScriptError('DISABLED_OPCODE', op, ip);
     }
 
     if (op >= opcodes.OP_IF && op <= opcodes.OP_ENDIF) {