diff --git a/src/arch/x86/include/arch/interrupt.h b/src/arch/x86/include/arch/interrupt.h
index 8c9b4a93d8..9753c502ee 100644
--- a/src/arch/x86/include/arch/interrupt.h
+++ b/src/arch/x86/include/arch/interrupt.h
@@ -23,9 +23,9 @@
 
 /* setup interrupt handlers for mainboard */
 #if CONFIG_PCI_OPTION_ROM_RUN_REALMODE
-extern void mainboard_interrupt_handlers(int intXX, void *intXX_func);
+extern void mainboard_interrupt_handlers(int intXX, int (*intXX_func)(void));
 #elif CONFIG_PCI_OPTION_ROM_RUN_YABEL
 #include <device/oprom/yabel/biosemu.h>
 #else
-static inline void mainboard_interrupt_handlers(int intXX, void *intXX_func) { }
+static inline void mainboard_interrupt_handlers(int intXX, int (*intXX_func)(void)) { }
 #endif
diff --git a/src/device/oprom/realmode/x86.c b/src/device/oprom/realmode/x86.c
index 338294df25..4385c03074 100644
--- a/src/device/oprom/realmode/x86.c
+++ b/src/device/oprom/realmode/x86.c
@@ -118,7 +118,7 @@ static int intXX_unknown_handler(void)
 }
 
 /* setup interrupt handlers for mainboard */
-void mainboard_interrupt_handlers(int intXX, void *intXX_func)
+void mainboard_interrupt_handlers(int intXX, int (*intXX_func)(void))
 {
 	intXX_handler[intXX] = intXX_func;
 }