diff --git a/pal/uefi_acpi/src/pal_peripherals.c b/pal/uefi_acpi/src/pal_peripherals.c
index 1655abf7..ed3abcb8 100644
--- a/pal/uefi_acpi/src/pal_peripherals.c
+++ b/pal/uefi_acpi/src/pal_peripherals.c
@@ -303,6 +303,7 @@ pal_memory_create_info_table(MEMORY_INFO_TABLE *memoryInfoTable)
       Status = EFI_OUT_OF_RESOURCES;
       return;
     }
+    MemoryMapSize = EFI_PAGES_TO_SIZE (Pages);
     Status = gBS->GetMemoryMap (&MemoryMapSize, MemoryMap, &MapKey, &DescriptorSize, &DescriptorVersion);
   }