diff --git a/renderdoc/driver/metal/CMakeLists.txt b/renderdoc/driver/metal/CMakeLists.txt
index 30577cad1..a325542ac 100644
--- a/renderdoc/driver/metal/CMakeLists.txt
+++ b/renderdoc/driver/metal/CMakeLists.txt
@@ -11,6 +11,7 @@ set(sources
     metal_resources.h
     metal_types_bridge.mm
     metal_types_bridge.h
+    metal_types.cpp
     metal_types.h
     metal_library.cpp
     metal_library.h
diff --git a/renderdoc/driver/metal/metal_types.cpp b/renderdoc/driver/metal/metal_types.cpp
new file mode 100644
index 000000000..e3d015994
--- /dev/null
+++ b/renderdoc/driver/metal/metal_types.cpp
@@ -0,0 +1,47 @@
+/******************************************************************************
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2022 Baldur Karlsson
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ ******************************************************************************/
+
+#include "metal_types.h"
+
+RDCCOMPILE_ASSERT(sizeof(NS::Integer) == sizeof(std::intptr_t), "NS::Integer size does not match");
+RDCCOMPILE_ASSERT(sizeof(NS::UInteger) == sizeof(std::uintptr_t),
+                  "NS::UInteger size does not match");
+
+template <typename SerialiserType>
+void DoSerialise(SerialiserType &ser, NS::String *&el)
+{
+  rdcstr rdcStr;
+  if(el)
+  {
+    rdcStr = el->utf8String();
+  }
+  DoSerialise(ser, rdcStr);
+
+  if(ser.IsReading())
+  {
+    el = NS::String::string(rdcStr.data(), NS::UTF8StringEncoding);
+  }
+}
+
+INSTANTIATE_SERIALISE_TYPE(NS::String *);
diff --git a/renderdoc/driver/metal/metal_types.h b/renderdoc/driver/metal/metal_types.h
index 3627cbffe..8af84d7ac 100644
--- a/renderdoc/driver/metal/metal_types.h
+++ b/renderdoc/driver/metal/metal_types.h
@@ -37,3 +37,11 @@
 
 METALCPP_WRAPPED_PROTOCOLS(DECLARE_OBJC_HELPERS)
 #undef DECLARE_OBJC_HELPERS
+
+template <>
+inline rdcliteral TypeName<NS::String *>()
+{
+  return "NSString"_lit;
+}
+template <class SerialiserType>
+void DoSerialise(SerialiserType &ser, NS::String *&el);