diff --git a/SourceLevelDebugPkg/Library/DebugAgent/SecPeiDebugAgent/SecPeiDebugAgentLib.c b/SourceLevelDebugPkg/Library/DebugAgent/SecPeiDebugAgent/SecPeiDebugAgentLib.c
index fcc7a4baf8..ea757423d1 100644
--- a/SourceLevelDebugPkg/Library/DebugAgent/SecPeiDebugAgent/SecPeiDebugAgentLib.c
+++ b/SourceLevelDebugPkg/Library/DebugAgent/SecPeiDebugAgent/SecPeiDebugAgentLib.c
@@ -684,6 +684,10 @@ InitializeDebugAgentPhase2 (
       TriggerSoftInterrupt (MEMORY_READY_SIGNATURE);
     }
     //
+    // Enable Debug Timer interrupt
+    //
+    SaveAndSetDebugTimerInterrupt (TRUE);
+    //
     // Enable CPU interrupts so debug timer interrupts can be delivered
     //
     EnableInterrupts ();