diff --git a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Driver.c b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Driver.c
index 792db5c173..03ba458a96 100644
--- a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Driver.c
+++ b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Driver.c
@@ -41,12 +41,20 @@ IpSec2InstalledCallback (
   IN VOID       *Context
   )
 {
+  EFI_STATUS    Status;
   //
-  // Close the event so it does not get called again.
+  // Test if protocol was even found.
+  // Notification function will be called at least once.
   //
-  gBS->CloseEvent (Event);
+  Status = gBS->LocateProtocol (&gEfiIpSec2ProtocolGuid, NULL, &mIpSec);
+  if (Status == EFI_SUCCESS && mIpSec != NULL) {
+    //
+    // Close the event so it does not get called again.
+    //
+    gBS->CloseEvent (Event);
 
-  mIpSec2Installed = TRUE;
+    mIpSec2Installed = TRUE;
+  }
 }
 
 /**
diff --git a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Input.c b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Input.c
index 09b8f2bac2..e694323019 100644
--- a/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Input.c
+++ b/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Input.c
@@ -1,7 +1,7 @@
 /** @file
   IP4 input process.
   
-Copyright (c) 2005 - 2014, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2005 - 2017, Intel Corporation. All rights reserved.<BR>
 (C) Copyright 2015 Hewlett-Packard Development Company, L.P.<BR>
 
 This program and the accompanying materials
@@ -518,6 +518,7 @@ Ip4IpSecProcessPacket (
   if (!mIpSec2Installed) {
     goto ON_EXIT;
   }
+  ASSERT (mIpSec != NULL);
   
   Packet        = *Netbuf;
   RecycleEvent  = NULL;
@@ -527,13 +528,6 @@ Ip4IpSecProcessPacket (
   FragmentCount = Packet->BlockOpNum;
 
   ZeroMem (&ZeroHead, sizeof (IP4_HEAD));
-  
-  if (mIpSec == NULL) {
-    gBS->LocateProtocol (&gEfiIpSec2ProtocolGuid, NULL, (VOID **) &mIpSec);
-    if (mIpSec == NULL) {
-      goto ON_EXIT;
-    }
-  }
 
   //
   // Check whether the IPsec enable variable is set.