diff --git a/c/src/lib/libbsp/arm/gba/irq/irq.c b/c/src/lib/libbsp/arm/gba/irq/irq.c
index abebc130e1..6abc48f6e3 100644
--- a/c/src/lib/libbsp/arm/gba/irq/irq.c
+++ b/c/src/lib/libbsp/arm/gba/irq/irq.c
@@ -157,7 +157,7 @@ void _ThreadProcessSignalsFromIrq (CPU_Exception_frame* ctx)
   if ( _Thread_Do_post_task_switch_extension ||
        _Thread_Executing->do_post_task_switch_extension )
   {
-     _Thread_Executing->do_post_task_switch_extension = FALSE;
+     _Thread_Executing->do_post_task_switch_extension = false;
      _API_extensions_Run_postswitch();
   }
 }