diff --git a/src/transport/raw/tests/NetworkTestHelpers.h b/src/transport/raw/tests/NetworkTestHelpers.h
index bf1e812a87fe02..49890406bc6afb 100644
--- a/src/transport/raw/tests/NetworkTestHelpers.h
+++ b/src/transport/raw/tests/NetworkTestHelpers.h
@@ -72,7 +72,12 @@ class LoopbackTransportDelegate
 class LoopbackTransport : public Transport::Base
 {
 public:
-    void InitLoopbackTransport(System::Layer * systemLayer) { mSystemLayer = systemLayer; }
+    void InitLoopbackTransport(System::Layer * systemLayer)
+    {
+        Reset();
+        mSystemLayer = systemLayer;
+    }
+
     void ShutdownLoopbackTransport()
     {
         // Make sure no one left packets hanging out that they thought got