diff --git a/include/asm-ppc64/system.h b/include/asm-ppc64/system.h
index 4104a5d..b9e1835 100644
--- a/include/asm-ppc64/system.h
+++ b/include/asm-ppc64/system.h
@@ -88,7 +88,7 @@
 DEBUGGER_BOILERPLATE(debugger_fault_handler)
 
 #ifdef CONFIG_XMON
-extern void xmon_init(void);
+extern void xmon_init(int enable);
 #endif
 
 #else