diff --git a/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c b/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
index 3dfabd87e5..3d3c3ef6ff 100644
--- a/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
+++ b/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
@@ -675,6 +675,11 @@ CoreExitBootServices (
 {
   EFI_STATUS                Status;
 
+  //
+  // Disable Timer
+  //
+  gTimer->SetTimerPeriod (gTimer, 0);
+
   //
   // Terminate memory services if the MapKey matches
   //
@@ -683,11 +688,6 @@ CoreExitBootServices (
     return Status;
   }
 
-  //
-  // Disable Timer
-  //
-  gTimer->SetTimerPeriod (gTimer, 0);
-
   //
   // Notify other drivers that we are exiting boot services.
   //