diff --git a/src/arch/x86/include/arch/interrupt.h b/src/arch/x86/include/arch/interrupt.h
index 2d2330b739..c3cda309b9 100644
--- a/src/arch/x86/include/arch/interrupt.h
+++ b/src/arch/x86/include/arch/interrupt.h
@@ -22,4 +22,8 @@
 #include "registers.h"
 
 /* setup interrupt handlers for mainboard */
+#if defined(CONFIG_PCI_OPTION_ROM_RUN_REALMODE) && CONFIG_PCI_OPTION_ROM_RUN_REALMODE
 extern void mainboard_interrupt_handlers(int intXX, void *intXX_func);
+#else
+static inline void mainboard_interrupt_handlers(int intXX, void *intXX_func) { }
+#endif