diff --git a/src/common/objects/dobjgc.cpp b/src/common/objects/dobjgc.cpp
index de4614664..40b29a680 100644
--- a/src/common/objects/dobjgc.cpp
+++ b/src/common/objects/dobjgc.cpp
@@ -58,21 +58,9 @@
 
 #include "dobject.h"
 #include "templates.h"
-#include "b_bot.h"
-#include "p_local.h"
-#include "g_game.h"
-#include "a_sharedglobal.h"
-#include "sbar.h"
 #include "c_dispatch.h"
-#include "s_sndseq.h"
-#include "r_data/r_interpolate.h"
-#include "doomstat.h"
-#include "po_man.h"
-#include "r_utility.h"
 #include "menu/menu.h"
-#include "intermission/intermission.h"
-#include "g_levellocals.h"
-#include "events.h"
+#include "stats.h"
 
 // MACROS ------------------------------------------------------------------
 
@@ -112,8 +100,6 @@
 
 // EXTERNAL DATA DECLARATIONS ----------------------------------------------
 
-extern DThinker *NextToThink;
-
 // PUBLIC DATA DEFINITIONS -------------------------------------------------
 
 namespace GC
@@ -274,26 +260,19 @@ void MarkArray(DObject **obj, size_t count)
 //
 //==========================================================================
 
+TArray<GCMarkerFunc> markers;
+void AddMarkerFunc(GCMarkerFunc func)
+{
+	if (markers.Find(func) == markers.Size())
+		markers.Push(func);
+}
+
 static void MarkRoot()
 {
 	Gray = NULL;
-	Mark(StatusBar);
-	M_MarkMenus();
-	Mark(DIntermissionController::CurrentIntermission);
-	Mark(staticEventManager.FirstEventHandler);
-	Mark(staticEventManager.LastEventHandler);
-	for (auto Level : AllLevels())
-		Level->Mark();
 
-	// Mark players.
-	for (int i = 0; i < MAXPLAYERS; i++)
-	{
-		if (playeringame[i])
-			players[i].PropagateMark();
-	}
-	
-	// NextToThink must not be freed while thinkers are ticking.
-	Mark(NextToThink);
+	for (auto func : markers) func();
+
 	// Mark soft roots.
 	if (SoftRoots != NULL)
 	{
diff --git a/src/common/objects/dobjgc.h b/src/common/objects/dobjgc.h
index 5a181c736..de187db6c 100644
--- a/src/common/objects/dobjgc.h
+++ b/src/common/objects/dobjgc.h
@@ -154,6 +154,10 @@ namespace GC
 	{
 		MarkArray(&arr[0], arr.Size());
 	}
+
+	using GCMarkerFunc = void(*)();
+	void AddMarkerFunc(GCMarkerFunc func);
+
 }
 
 // A template class to help with handling read barriers. It does not
diff --git a/src/common/scripting/core/types.cpp b/src/common/scripting/core/types.cpp
index 5211bc956..d06c08250 100644
--- a/src/common/scripting/core/types.cpp
+++ b/src/common/scripting/core/types.cpp
@@ -1115,7 +1115,7 @@ void PSpriteID::WriteValue(FSerializer &ar, const char *key, const void *addr) c
 
 bool PSpriteID::ReadValue(FSerializer &ar, const char *key, void *addr) const
 {
-	int32_t val;
+	int32_t val = 0;
 #ifdef GZDOOM
 	ar.Sprite(key, val, nullptr);
 #endif
diff --git a/src/d_main.cpp b/src/d_main.cpp
index 69301e295..ee515f689 100644
--- a/src/d_main.cpp
+++ b/src/d_main.cpp
@@ -2748,6 +2748,27 @@ static void Doom_CastSpriteIDToString(FString* a, unsigned int b)
 	*a = (b >= sprites.Size()) ? "TNT1" : sprites[b].name; 
 }
 
+
+extern DThinker* NextToThink;
+
+static void GC_MarkGameRoots()
+{
+	GC::Mark(DIntermissionController::CurrentIntermission);
+	GC::Mark(staticEventManager.FirstEventHandler);
+	GC::Mark(staticEventManager.LastEventHandler);
+	for (auto Level : AllLevels())
+		Level->Mark();
+
+	// Mark players.
+	for (int i = 0; i < MAXPLAYERS; i++)
+	{
+		if (playeringame[i])
+			players[i].PropagateMark();
+	}
+
+	// NextToThink must not be freed while thinkers are ticking.
+	GC::Mark(NextToThink);
+}
 //==========================================================================
 //
 // D_DoomMain
@@ -2764,6 +2785,7 @@ static int D_DoomMain_Internal (void)
 	int argcount;	
 	FIWadManager *iwad_man;
 
+	GC::AddMarkerFunc(GC_MarkGameRoots);
 	VM_CastSpriteIDToString = Doom_CastSpriteIDToString;
 
 	// Set up the button list. Mlook and Klook need a bit of extra treatment.
diff --git a/src/g_statusbar/shared_sbar.cpp b/src/g_statusbar/shared_sbar.cpp
index e294c716a..a8487c349 100644
--- a/src/g_statusbar/shared_sbar.cpp
+++ b/src/g_statusbar/shared_sbar.cpp
@@ -259,6 +259,7 @@ void ST_CreateStatusBar(bool bTitleLevel)
 		StatusBar->Destroy();
 		StatusBar = NULL;
 	}
+	GC::AddMarkerFunc([]() { GC::Mark(StatusBar); });
 
 	bool shouldWarn = true;
 
diff --git a/src/menu/menu.cpp b/src/menu/menu.cpp
index 5f354d934..13cb0d956 100644
--- a/src/menu/menu.cpp
+++ b/src/menu/menu.cpp
@@ -952,6 +952,7 @@ void M_Init (void)
 	try
 	{
 		M_ParseMenuDefs();
+		GC::AddMarkerFunc(M_MarkMenus);
 	}
 	catch (CVMAbortException &err)
 	{