diff --git a/rEFIt_UEFI/Platform/DataHubCpu.cpp b/rEFIt_UEFI/Platform/DataHubCpu.cpp
index 5b8f4ff43..c5cdb308e 100644
--- a/rEFIt_UEFI/Platform/DataHubCpu.cpp
+++ b/rEFIt_UEFI/Platform/DataHubCpu.cpp
@@ -447,6 +447,9 @@ SetVariablesForOSX(LOADER_ENTRY *Entry)
   LangLen = 0;
   AddNvramVariable(L"wake-failure", &gEfiAppleBootGuid, Attributes, 5, &LangLen);
 
+  //clear OC present
+  DeleteNvramVariable(L"opencore-version", &gEfiAppleBootGuid);
+
   return EFI_SUCCESS;
 }
 
diff --git a/rEFIt_UEFI/Platform/Nvram.cpp b/rEFIt_UEFI/Platform/Nvram.cpp
index b74b97e52..e266fee7e 100755
--- a/rEFIt_UEFI/Platform/Nvram.cpp
+++ b/rEFIt_UEFI/Platform/Nvram.cpp
@@ -380,7 +380,7 @@ ResetNativeNvram ()
   //DbgHeader("ResetNativeNvram: cleanup NVRAM variables");
 
   NameSize = sizeof (CHAR16);
-  Name = (__typeof__(Name))AllocateZeroPool(NameSize);
+  Name = (__typeof__(Name))AllocatePool(NameSize);
   if (Name == NULL) {
     return Status;
   }