diff --git a/xtoskrnl/ar/amd64/procsup.cc b/xtoskrnl/ar/amd64/procsup.cc
index 229a668..30fdda5 100644
--- a/xtoskrnl/ar/amd64/procsup.cc
+++ b/xtoskrnl/ar/amd64/procsup.cc
@@ -476,8 +476,9 @@ AR::ProcessorSupport::InitializeProcessorBlock(OUT PKPROCESSOR_BLOCK ProcessorBl
     /* Set initial MXCSR register value */
     ProcessorBlock->Prcb.MxCsr = INITIAL_MXCSR;
 
-    /* Set initial runlevel */
+    /* Set initial runlevel and mark processor as started */
     ProcessorBlock->RunLevel = PASSIVE_LEVEL;
+    ProcessorBlock->Started = TRUE;
 }
 
 /**
diff --git a/xtoskrnl/ar/i686/procsup.cc b/xtoskrnl/ar/i686/procsup.cc
index 98e55e6..9b4d991 100644
--- a/xtoskrnl/ar/i686/procsup.cc
+++ b/xtoskrnl/ar/i686/procsup.cc
@@ -465,8 +465,9 @@ AR::ProcessorSupport::InitializeProcessorBlock(OUT PKPROCESSOR_BLOCK ProcessorBl
     ProcessorBlock->Prcb.IdleThread = &(KE::KThread::GetInitialThread())->ThreadControlBlock;
     ProcessorBlock->Prcb.NextThread = NULLPTR;
 
-    /* Set initial runlevel */
+    /* Set initial runlevel and mark processor as started */
     ProcessorBlock->RunLevel = PASSIVE_LEVEL;
+    ProcessorBlock->Started = TRUE;
 }
 
 /**