diff --git a/mdl/m_ops.pas b/mdl/m_ops.pas
index d6c5a06..6f4f2fc 100644
--- a/mdl/m_ops.pas
+++ b/mdl/m_ops.pas
@@ -64,6 +64,7 @@
 {$FPUTYPE SSE}
 {$IMPLICITEXCEPTIONS OFF}
 {$OBJECTCHECKS OFF}
+{$MODESWITCH NESTEDPROCVARS}
 
 {$IFDEF DEBUG}
   {$DEBUGINFO ON}