diff --git a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/Thunk.c b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/Thunk.c
index 16c873d8f5..3d9a8b9649 100644
--- a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/Thunk.c
+++ b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/Thunk.c
@@ -314,15 +314,15 @@ InternalLegacyBiosFarCall (
 
   mThunkContext.RealModeState = NULL;
 
-  //
-  // End critical section
-  //
-  gBS->RestoreTPL (OriginalTpl);
-
   //
   // Enable and restore rate of DXE Timer
   //
   Private->Timer->SetTimerPeriod (Private->Timer, TimerPeriod);
+
+  //
+  // End critical section
+  //
+  gBS->RestoreTPL (OriginalTpl);
   
   //
   // Restore interrupt of debug timer