diff --git a/include/efi.h b/include/efi.h
index 3c9d20f8c0..5f415a99cc 100644
--- a/include/efi.h
+++ b/include/efi.h
@@ -168,6 +168,10 @@ enum efi_mem_type {
 	 * part of the processor.
 	 */
 	EFI_PAL_CODE,
+	/*
+	 * Non-volatile memory.
+	 */
+	EFI_PERSISTENT_MEMORY_TYPE,
 
 	EFI_MAX_MEMORY_TYPE,
 	EFI_TABLE_END,	/* For efi_build_mem_table() */
diff --git a/lib/efi_loader/efi_memory.c b/lib/efi_loader/efi_memory.c
index 46681dc208..987cc6dc5f 100644
--- a/lib/efi_loader/efi_memory.c
+++ b/lib/efi_loader/efi_memory.c
@@ -376,6 +376,10 @@ efi_status_t efi_allocate_pages(int type, int memory_type,
 	efi_status_t r = EFI_SUCCESS;
 	uint64_t addr;
 
+	/* Check import parameters */
+	if (memory_type >= EFI_PERSISTENT_MEMORY_TYPE &&
+	    memory_type <= 0x6FFFFFFF)
+		return EFI_INVALID_PARAMETER;
 	if (!memory)
 		return EFI_INVALID_PARAMETER;