diff --git a/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c b/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
index 8a877330dd733..5471e4259da43 100644
--- a/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
+++ b/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
@@ -203,6 +203,8 @@ EFI_HANDLE            gDxeCoreImageHandle = NULL;
 
 BOOLEAN  gMemoryMapTerminated = FALSE;
 
+static BOOLEAN  mExitBootServicesCalled = FALSE;
+
 //
 // EFI Decompress Protocol
 //
@@ -778,7 +780,10 @@ CoreExitBootServices (
   // Notify other drivers of their last chance to use boot services
   // before the memory map is terminated.
   //
-  CoreNotifySignalList (&gEfiEventBeforeExitBootServicesGuid);
+  if (!mExitBootServicesCalled) {
+    CoreNotifySignalList (&gEfiEventBeforeExitBootServicesGuid);
+    mExitBootServicesCalled = TRUE;
+  }
 
   //
   // Disable Timer