diff --git a/MdeModulePkg/Universal/DebugSupportDxe/Ia32/plDebugSupport.c b/MdeModulePkg/Universal/DebugSupportDxe/Ia32/plDebugSupport.c
index 1eaa5ec591..d7f254b15f 100644
--- a/MdeModulePkg/Universal/DebugSupportDxe/Ia32/plDebugSupport.c
+++ b/MdeModulePkg/Universal/DebugSupportDxe/Ia32/plDebugSupport.c
@@ -180,7 +180,7 @@ Returns:
 
   Status = EFI_SUCCESS;
 
-  if (FeaturePcdGet (PcdNtEmulatorEnable)) {
+  if (!FeaturePcdGet (PcdNtEmulatorEnable)) {
     if (CompareDescriptor (&IdtEntryTable[ExceptionType].NewDesc, &NullDesc)) {
       //
       // we've already installed to this vector