diff --git a/Il2CppInspector.Common/Cpp/CppNamespace.cs b/Il2CppInspector.Common/Cpp/CppNamespace.cs
index 9a0cbe3..47d42f9 100644
--- a/Il2CppInspector.Common/Cpp/CppNamespace.cs
+++ b/Il2CppInspector.Common/Cpp/CppNamespace.cs
@@ -7,7 +7,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.Text;
 
 namespace Il2CppInspector.Cpp
 {
@@ -31,6 +30,14 @@ namespace Il2CppInspector.Cpp
             renameCount[name] = 0;
         }
 
+        // Try to mark a name as reserved without assigning an object to it (e.g. for keywords and built-in names)
+        public bool TryReserveName(string name) {
+            if (renameCount.ContainsKey(name))
+                return false;
+            renameCount[name] = 0;
+            return true;
+        }
+
         // Create a Namer object which will give names to objects of type T which are unique within this namespace
         public Namer<T> MakeNamer<T>(Namer<T>.KeyFunc keyFunc) {
             return new Namer<T>(this, keyFunc);
diff --git a/Il2CppInspector.Common/Cpp/CppTypeCollection.cs b/Il2CppInspector.Common/Cpp/CppTypeCollection.cs
index d6c55a4..90f7d9b 100644
--- a/Il2CppInspector.Common/Cpp/CppTypeCollection.cs
+++ b/Il2CppInspector.Common/Cpp/CppTypeCollection.cs
@@ -577,29 +577,24 @@ namespace Il2CppInspector.Cpp
             cppTypes.SetGroup("il2cpp");
             
             // Add junk from config files we haven't included
+            // TODO: Remove these two lines when resolving #79
             cppTypes.TypedefAliases.Add("Il2CppIManagedObjectHolder", cppTypes["void"].AsPointer(wordSize));
             cppTypes.TypedefAliases.Add("Il2CppIUnknown", cppTypes["void"].AsPointer(wordSize));
 
             var headers = header.GetTypeHeaderText(wordSize);
             cppTypes.AddFromDeclarationText(headers);
 
-            // Don't allow any of the header type names to be re-used; ignore primitive types
-            foreach (var type in cppTypes.GetTypeGroup("il2cpp"))
-                declGen?.TypeNamespace.ReserveName(type.Name);
-
-            foreach (var typedef in cppTypes.GetTypedefGroup("il2cpp"))
-                declGen?.GlobalsNamespace.ReserveName(typedef.Name);
-
             cppTypes.SetGroup("il2cpp-api");
 
             var apis = header.GetAPIHeaderTypedefText();
             cppTypes.AddFromDeclarationText(apis);
 
-            foreach (var type in cppTypes.GetTypeGroup("il2cpp-api"))
-                declGen?.TypeNamespace.ReserveName(type.Name);
+            // Don't allow any of the header type names or primitive type names to be re-used
+            foreach (var type in cppTypes.Types.Values)
+                declGen?.TypeNamespace.TryReserveName(type.Name);
 
-            foreach (var typedef in cppTypes.GetTypedefGroup("il2cpp-api"))
-                declGen?.GlobalsNamespace.ReserveName(typedef.Name);
+            foreach (var typedef in cppTypes.TypedefAliases.Values)
+                declGen?.GlobalsNamespace.TryReserveName(typedef.Name);
 
             cppTypes.SetGroup("");