diff --git a/arch/nios2/include/asm/system.h b/arch/nios2/include/asm/system.h
index 6213a16..b158535 100644
--- a/arch/nios2/include/asm/system.h
+++ b/arch/nios2/include/asm/system.h
@@ -45,4 +45,6 @@
 	"callr	%0"					\
 	: : "r" (addr))
 
+void display_sysid(void);
+
 #endif /* __ASM_NIOS2_SYSTEM_H */