diff --git a/src/script/script_instance.cpp b/src/script/script_instance.cpp
index 7c2fa43d67..c354126ca7 100644
--- a/src/script/script_instance.cpp
+++ b/src/script/script_instance.cpp
@@ -254,9 +254,12 @@ void ScriptInstance::GameLoop()
 	}
 }
 
-void ScriptInstance::CollectGarbage() const
+void ScriptInstance::CollectGarbage()
 {
-	if (this->is_started && !this->IsDead()) this->engine->CollectGarbage();
+	if (this->is_started && !this->IsDead()) {
+		ScriptObject::ActiveInstance active(this);
+		this->engine->CollectGarbage();
+	}
 }
 
 /* static */ void ScriptInstance::DoCommandReturn(ScriptInstance *instance)
diff --git a/src/script/script_instance.hpp b/src/script/script_instance.hpp
index 4709c44e2f..7db4f5ea8f 100644
--- a/src/script/script_instance.hpp
+++ b/src/script/script_instance.hpp
@@ -68,7 +68,7 @@ public:
 	/**
 	 * Let the VM collect any garbage.
 	 */
-	void CollectGarbage() const;
+	void CollectGarbage();
 
 	/**
 	 * Get the storage of this script.