diff --git a/src/include/ipxe/netdevice.h b/src/include/ipxe/netdevice.h
index 2ea3c8bb..6ef9cb1e 100644
--- a/src/include/ipxe/netdevice.h
+++ b/src/include/ipxe/netdevice.h
@@ -658,6 +658,8 @@ netdev_rx_frozen ( struct net_device *netdev ) {
 	return ( netdev->state & NETDEV_RX_FROZEN );
 }
 
+extern void netdev_rx_freeze ( struct net_device *netdev );
+extern void netdev_rx_unfreeze ( struct net_device *netdev );
 extern void netdev_link_err ( struct net_device *netdev, int rc );
 extern void netdev_link_down ( struct net_device *netdev );
 extern int netdev_tx ( struct net_device *netdev, struct io_buffer *iobuf );
@@ -733,24 +735,4 @@ netdev_link_up ( struct net_device *netdev ) {
 	netdev_link_err ( netdev, 0 );
 }
 
-/**
- * Freeze network device receive queue processing
- *
- * @v netdev		Network device
- */
-static inline __attribute__ (( always_inline )) void
-netdev_rx_freeze ( struct net_device *netdev ) {
-	netdev->state |= NETDEV_RX_FROZEN;
-}
-
-/**
- * Unfreeze network device receive queue processing
- *
- * @v netdev		Network device
- */
-static inline __attribute__ (( always_inline )) void
-netdev_rx_unfreeze ( struct net_device *netdev ) {
-	netdev->state &= ~NETDEV_RX_FROZEN;
-}
-
 #endif /* _IPXE_NETDEVICE_H */
diff --git a/src/net/netdevice.c b/src/net/netdevice.c
index 82d0e82b..4a42ef42 100644
--- a/src/net/netdevice.c
+++ b/src/net/netdevice.c
@@ -108,6 +108,34 @@ static void netdev_notify ( struct net_device *netdev ) {
 	}
 }
 
+/**
+ * Freeze network device receive queue processing
+ *
+ * @v netdev		Network device
+ */
+void netdev_rx_freeze ( struct net_device *netdev ) {
+
+	/* Mark receive queue processing as frozen */
+	netdev->state |= NETDEV_RX_FROZEN;
+
+	/* Notify drivers of change */
+	netdev_notify ( netdev );
+}
+
+/**
+ * Unfreeze network device receive queue processing
+ *
+ * @v netdev		Network device
+ */
+void netdev_rx_unfreeze ( struct net_device *netdev ) {
+
+	/* Mark receive queue processing as not frozen */
+	netdev->state &= ~NETDEV_RX_FROZEN;
+
+	/* Notify drivers of change */
+	netdev_notify ( netdev );
+}
+
 /**
  * Mark network device as having a specific link state
  *