diff --git a/bsps/arm/csb336/include/bsp.h b/bsps/arm/csb336/include/bsp.h
index 9e6cbf709a..996708fe80 100644
--- a/bsps/arm/csb336/include/bsp.h
+++ b/bsps/arm/csb336/include/bsp.h
@@ -50,7 +50,7 @@ int get_perclk1_freq(void);
 /**
  * @brief Network driver configuration
  */
-extern struct rtems_bsdnet_ifconfig *config;
+struct rtems_bsdnet_ifconfig;
 
 /* Change these to match your board */
 int rtems_mc9328mxl_enet_attach(struct rtems_bsdnet_ifconfig *config,
diff --git a/bsps/arm/csb337/include/bsp.h b/bsps/arm/csb337/include/bsp.h
index d5daa63d3e..52f7a57710 100644
--- a/bsps/arm/csb337/include/bsp.h
+++ b/bsps/arm/csb337/include/bsp.h
@@ -61,7 +61,7 @@ static inline int32_t BSP_get_baud(void) {return 38400;}
 /**
  * @brief Network driver configuration
  */
-extern struct rtems_bsdnet_ifconfig *config;
+struct rtems_bsdnet_ifconfig;
 
 /* Change these to match your board */
 int rtems_at91rm9200_emac_attach(struct rtems_bsdnet_ifconfig *config, int attaching);
diff --git a/bsps/mips/csb350/include/bsp.h b/bsps/mips/csb350/include/bsp.h
index df39b02150..26dbe3c17b 100644
--- a/bsps/mips/csb350/include/bsp.h
+++ b/bsps/mips/csb350/include/bsp.h
@@ -44,7 +44,7 @@ extern "C" {
 /*
  * Network driver configuration
  */
-extern struct rtems_bsdnet_ifconfig *config;
+struct rtems_bsdnet_ifconfig;
 
 int rtems_au1x00_emac_attach(struct rtems_bsdnet_ifconfig *config,
                              int attaching);