diff --git a/renderdoc/driver/metal/metal_resources.cpp b/renderdoc/driver/metal/metal_resources.cpp
index 9cecd12f4..a4d65fb93 100644
--- a/renderdoc/driver/metal/metal_resources.cpp
+++ b/renderdoc/driver/metal/metal_resources.cpp
@@ -25,6 +25,14 @@
 #include "metal_resources.h"
 #include "metal_device.h"
 
+ResourceId GetResID(WrappedMTLObject *obj)
+{
+  if(obj == NULL)
+    return ResourceId();
+
+  return obj->id;
+}
+
 void WrappedMTLObject::Dealloc()
 {
   // TODO: call the wrapped object destructor
diff --git a/renderdoc/driver/metal/metal_resources.h b/renderdoc/driver/metal/metal_resources.h
index 358632099..4f3cbfd29 100644
--- a/renderdoc/driver/metal/metal_resources.h
+++ b/renderdoc/driver/metal/metal_resources.h
@@ -75,6 +75,8 @@ struct WrappedMTLObject
   CaptureState &m_State;
 };
 
+ResourceId GetResID(WrappedMTLObject *obj);
+
 template <typename RealType>
 RealType Unwrap(WrappedMTLObject *obj)
 {