diff --git a/src/include/cpu/amd/amdfam10_sysconf.h b/src/include/cpu/amd/amdfam10_sysconf.h
index aa35c714b6..a226c51f91 100644
--- a/src/include/cpu/amd/amdfam10_sysconf.h
+++ b/src/include/cpu/amd/amdfam10_sysconf.h
@@ -69,4 +69,6 @@ extern struct amdfam10_sysconf_t sysconf;
 void get_bus_conf(void);
 void get_pci1234(void);
 
+extern u8 pirq_router_bus;
+
 #endif
diff --git a/src/northbridge/amd/amdfam10/northbridge.c b/src/northbridge/amd/amdfam10/northbridge.c
index 245e3abb99..d652746765 100644
--- a/src/northbridge/amd/amdfam10/northbridge.c
+++ b/src/northbridge/amd/amdfam10/northbridge.c
@@ -54,6 +54,7 @@
 #endif
 
 struct amdfam10_sysconf_t sysconf;
+u8 pirq_router_bus;
 
 #define FX_DEVS NODE_NUMS
 static struct device *__f0_dev[FX_DEVS];