diff --git a/Userland/Libraries/LibWeb/DOM/ProcessingInstruction.cpp b/Userland/Libraries/LibWeb/DOM/ProcessingInstruction.cpp
index dd04806c54..54e5126456 100644
--- a/Userland/Libraries/LibWeb/DOM/ProcessingInstruction.cpp
+++ b/Userland/Libraries/LibWeb/DOM/ProcessingInstruction.cpp
@@ -4,6 +4,8 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/DOM/Document.h>
 #include <LibWeb/DOM/ProcessingInstruction.h>
 #include <LibWeb/Layout/TextNode.h>
 
@@ -13,6 +15,7 @@ ProcessingInstruction::ProcessingInstruction(Document& document, DeprecatedStrin
     : CharacterData(document, NodeType::PROCESSING_INSTRUCTION_NODE, data)
     , m_target(target)
 {
+    set_prototype(&Bindings::cached_web_prototype(document.realm(), "ProcessingInstruction"));
 }
 
 }