diff --git a/Assets/Scripts/QuakeParms.cs b/Assets/Scripts/QuakeParms.cs
index 7d5c845..cc1f25e 100644
--- a/Assets/Scripts/QuakeParms.cs
+++ b/Assets/Scripts/QuakeParms.cs
@@ -49,7 +49,13 @@ public class QuakeParms
     public void AllocateMemory(int memorySize)
     {
         memSize = memorySize;
+        
+#if UNITY_GAMECORE
+        memBase = SystemLibrary.HeapAlloc(SystemLibrary.GetProcessHeap(), 0, new IntPtr(memorySize));
+#else
         memBase = Marshal.AllocHGlobal(memorySize);
+#endif
+        
         if (memBase == IntPtr.Zero)
         {
             throw new OutOfMemoryException($"Could not allocate {memorySize / 1024 / 1024} MB of heap memory!");
@@ -66,7 +72,11 @@ public class QuakeParms
         
         if (memBase != IntPtr.Zero)
         {
+#if UNITY_GAMECORE
+            SystemLibrary.HeapFree(SystemLibrary.GetProcessHeap(), 0, memBase);
+#else
             Marshal.FreeHGlobal(memBase);
+#endif
             memBase = IntPtr.Zero;
         }
 
diff --git a/Assets/Scripts/SystemLibrary.cs b/Assets/Scripts/SystemLibrary.cs
index 33beb41..ce90776 100644
--- a/Assets/Scripts/SystemLibrary.cs
+++ b/Assets/Scripts/SystemLibrary.cs
@@ -53,4 +53,16 @@ public static class SystemLibrary
     [DllImport("SceKernelShim.prx")]
     public static extern IntPtr GetProcAddress(IntPtr hModule, string procedureName);
 #endif
+    
+#if UNITY_GAMECORE
+    [DllImport("kernel32", SetLastError = true)]
+    public static extern IntPtr GetProcessHeap();
+    
+    [DllImport("kernel32")]
+    public static extern IntPtr HeapAlloc(IntPtr hHeap, int dwFlags, IntPtr dwBytes);
+
+    [DllImport("kernel32")]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    public static extern bool HeapFree(IntPtr hHeap, int dwFlags, IntPtr lpMem);
+#endif
 }
diff --git a/Assets/Scripts/UniQuake.cs b/Assets/Scripts/UniQuake.cs
index 15cdbaf..f7565c1 100644
--- a/Assets/Scripts/UniQuake.cs
+++ b/Assets/Scripts/UniQuake.cs
@@ -5,11 +5,7 @@ using UnityEngine;
 
 public partial class UniQuake: MonoBehaviour
 {
-#if UNITY_GAMECORE
-    private const int DefaultMemSize = 0x2000000;  // Xbox is limited to 32 MB of heap space for now...
-#else
     private const int DefaultMemSize = 0x8000000;  // 128 MB of heap space
-#endif
 
     public int memorySize = DefaultMemSize;