diff --git a/src/drivers/net/3c509.c b/src/drivers/net/3c509.c
index bc21978f1..cc88c299f 100644
--- a/src/drivers/net/3c509.c
+++ b/src/drivers/net/3c509.c
@@ -311,7 +311,7 @@ static const char * t509_name ( struct bus_dev *bus_dev __unused ) {
  * T509 bus operations table
  *
  */
-struct bus_driver t509_driver __bus_driver = {
+static struct bus_driver t509_driver __bus_driver = {
 	.next_location	= t509_next_location,
 	.fill_device	= t509_fill_device,
 	.check_driver	= t509_check_driver,
diff --git a/src/drivers/net/3c515.c b/src/drivers/net/3c515.c
index 10157ad27..9edb3aab8 100644
--- a/src/drivers/net/3c515.c
+++ b/src/drivers/net/3c515.c
@@ -66,7 +66,7 @@ static void t3c515_wait(unsigned int nticks)
 #define s16 signed short
 #define s32 signed long
 static int if_port;
-struct corkscrew_private *vp;
+static struct corkscrew_private *vp;
 /* Brought directly from 3c515.c by Becker */
 #define CORKSCREW 1
 
diff --git a/src/drivers/net/3c5x9.c b/src/drivers/net/3c5x9.c
index 1e0fad80d..b2575bc0f 100644
--- a/src/drivers/net/3c5x9.c
+++ b/src/drivers/net/3c5x9.c
@@ -327,7 +327,7 @@ static int get_e ( uint16_t ioaddr, int offset ) {
 	return (inw(ioaddr + EP_W0_EEPROM_DATA));
 }
 
-struct nic_operations t509_operations = {
+static struct nic_operations t509_operations = {
 	.connect	= dummy_connect,
 	.poll		= t509_poll,
 	.transmit	= t509_transmit,