diff --git a/ArmVirtPkg/ArmVirtQemu.dsc b/ArmVirtPkg/ArmVirtQemu.dsc
index 8a60b61f2a..7b220d6e3c 100644
--- a/ArmVirtPkg/ArmVirtQemu.dsc
+++ b/ArmVirtPkg/ArmVirtQemu.dsc
@@ -261,6 +261,8 @@
   MdeModulePkg/Universal/Variable/RuntimeDxe/VariableRuntimeDxe.inf {
     <LibraryClasses>
       NULL|MdeModulePkg/Library/VarCheckUefiLib/VarCheckUefiLib.inf
+      # don't use unaligned CopyMem () on the UEFI varstore NOR flash region
+      BaseMemoryLib|MdePkg/Library/BaseMemoryLib/BaseMemoryLib.inf
   }
 !if $(SECURE_BOOT_ENABLE) == TRUE
   MdeModulePkg/Universal/SecurityStubDxe/SecurityStubDxe.inf {
diff --git a/ArmVirtPkg/ArmVirtQemuKernel.dsc b/ArmVirtPkg/ArmVirtQemuKernel.dsc
index 9a31ec93ca..7c032e1b07 100644
--- a/ArmVirtPkg/ArmVirtQemuKernel.dsc
+++ b/ArmVirtPkg/ArmVirtQemuKernel.dsc
@@ -252,6 +252,8 @@
   MdeModulePkg/Universal/Variable/RuntimeDxe/VariableRuntimeDxe.inf {
     <LibraryClasses>
       NULL|MdeModulePkg/Library/VarCheckUefiLib/VarCheckUefiLib.inf
+      # don't use unaligned CopyMem () on the UEFI varstore NOR flash region
+      BaseMemoryLib|MdePkg/Library/BaseMemoryLib/BaseMemoryLib.inf
   }
 !if $(SECURE_BOOT_ENABLE) == TRUE
   MdeModulePkg/Universal/SecurityStubDxe/SecurityStubDxe.inf {