diff --git a/include/asm-cris/system.h b/include/asm-cris/system.h
index d486701..1d63c2a 100644
--- a/include/asm-cris/system.h
+++ b/include/asm-cris/system.h
@@ -71,4 +71,6 @@
 
 #define arch_align_stack(x) (x)
 
+void default_idle(void);
+
 #endif