diff --git a/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c b/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
index 9da00f1275..52419f0796 100644
--- a/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
+++ b/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
@@ -199,6 +199,7 @@ UpdateVariableStore (
   // Check if the Data is Volatile.
   //
   if (!Volatile) {
+    ASSERT (Fvb != NULL);
     Status = Fvb->GetPhysicalAddress(Fvb, &FvVolHdr);
     ASSERT_EFI_ERROR (Status);