diff --git a/MdeModulePkg/Universal/Variable/Pei/Variable.c b/MdeModulePkg/Universal/Variable/Pei/Variable.c
index c03d2b5dfd..5043f19c51 100644
--- a/MdeModulePkg/Universal/Variable/Pei/Variable.c
+++ b/MdeModulePkg/Universal/Variable/Pei/Variable.c
@@ -383,6 +383,10 @@ GetVariableStore (
         }
       }
       break;
+
+    default:
+      ASSERT (FALSE);
+      break;
   }
 
   return VariableStoreHeader;