diff --git a/kernel/entry.asm b/kernel/entry.asm
index 3d4742e..9f46ff2 100644
--- a/kernel/entry.asm
+++ b/kernel/entry.asm
@@ -41,7 +41,9 @@ segment HMA_TEXT
                 extern   _user_r
                 extern   _ErrorMode
                 extern   _InDOS
+%IFDEF WIN31SUPPORT
                 extern   _winInstanced
+%ENDIF ; WIN31SUPPORT
                 extern   _cu_psp
                 extern   _MachineId
                 extern   critical_sp