diff --git a/lib/script/script.js b/lib/script/script.js
index 3aedf8c2..34b84c6e 100644
--- a/lib/script/script.js
+++ b/lib/script/script.js
@@ -589,8 +589,11 @@ Script.prototype.execute = function execute(stack, flags, tx, index, value, vers
     if (op.isDisabled())
       throw new ScriptError('DISABLED_OPCODE', op, ip);
 
-    if (negate && !op.isBranch())
+    if (negate && !op.isBranch()) {
+      if (stack.length + alt.length > consensus.MAX_SCRIPT_STACK)
+        throw new ScriptError('STACK_SIZE', op, ip);
       continue;
+    }
 
     if (op.data) {
       if (minimal && !op.isMinimal())