diff --git a/os/ports/GCC/PPC/ivor.s b/os/ports/GCC/PPC/ivor.s
index 8235af0e5..46dc66bf5 100644
--- a/os/ports/GCC/PPC/ivor.s
+++ b/os/ports/GCC/PPC/ivor.s
@@ -86,11 +86,6 @@ _IVOR10:
         lis         %r3, 0x0800             /* DIS bit mask.                */
         mtspr       336, %r3                /* TSR register.                */
 
-#if PPC_USE_IRQ_PREEMPTION
-        /* Allows preemption while executing the software handler.*/
-        wrteei      1
-#endif
-
 #if CH_DBG_SYSTEM_STATE_CHECK
         bl          dbg_check_enter_isr
         bl          dbg_check_lock_from_isr
@@ -101,11 +96,6 @@ _IVOR10:
         bl          dbg_check_leave_isr
 #endif
 
-#if PPC_USE_IRQ_PREEMPTION
-        /* Prevents preemption again.*/
-        wrteei      0
-#endif
-
         /* System tick handler invocation.*/
 #if CH_DBG_SYSTEM_STATE_CHECK
         bl          dbg_check_lock