diff --git a/MdeModulePkg/Universal/Variable/Pei/Variable.c b/MdeModulePkg/Universal/Variable/Pei/Variable.c
index 26f95c6d95..9f3d43486c 100644
--- a/MdeModulePkg/Universal/Variable/Pei/Variable.c
+++ b/MdeModulePkg/Universal/Variable/Pei/Variable.c
@@ -1336,6 +1336,7 @@ CalculateHobVariableCacheSize (
   VARIABLE_STORE_HEADER  *VariableStoreHeader;
 
   VariableStoreHeader = NULL;
+  ZeroMem (&StoreInfo, sizeof (VARIABLE_STORE_INFO));
   GetHobVariableStore (&StoreInfo, &VariableStoreHeader);
 
   if (VariableStoreHeader == NULL) {