diff --git a/MdeModulePkg/Universal/Acpi/AcpiTableDxe/AcpiTable.c b/MdeModulePkg/Universal/Acpi/AcpiTableDxe/AcpiTable.c
index 696974e325..f39de844e0 100644
--- a/MdeModulePkg/Universal/Acpi/AcpiTableDxe/AcpiTable.c
+++ b/MdeModulePkg/Universal/Acpi/AcpiTableDxe/AcpiTable.c
@@ -21,7 +21,7 @@
 // Handle to install ACPI Table Protocol
 //
 EFI_HANDLE    mHandle = NULL;
-GLOBAL_REMOVE_IF_UNREFERENCED EFI_ACPI_TABLE_INSTANCE   *mPrivateData;
+GLOBAL_REMOVE_IF_UNREFERENCED EFI_ACPI_TABLE_INSTANCE   *mPrivateData = NULL;
 
 /**
   Entry point of the ACPI table driver.