diff --git a/internal/pkg/pmmgr/onu_metrics_manager.go b/internal/pkg/pmmgr/onu_metrics_manager.go
index 5ed462a..2ce6174 100755
--- a/internal/pkg/pmmgr/onu_metrics_manager.go
+++ b/internal/pkg/pmmgr/onu_metrics_manager.go
@@ -3872,3 +3872,10 @@
 	controlBlock[7] = 0
 	return controlBlock
 }
+
+// PrepareForGarbageCollection - remove references to prepare for garbage collection
+func (mm *OnuMetricsManager) PrepareForGarbageCollection(ctx context.Context, aDeviceID string) {
+	logger.Debugw(ctx, "prepare for garbage collection", log.Fields{"device-id": aDeviceID})
+	mm.pDeviceHandler = nil
+	mm.pOnuDeviceEntry = nil
+}