diff --git a/drivers/net/ipg.c b/drivers/net/ipg.c
index af7499445bb1686cb6edc8aa67e269cb53d1a3df..40ce90dedb0285bc13f5f9068bce938f3a531769 100644
--- a/drivers/net/ipg.c
+++ b/drivers/net/ipg.c
@@ -1807,9 +1807,9 @@ static int ipg_nic_open(struct net_device *dev)
 	sp->jumbo.found_start = 0;
 	sp->jumbo.current_size = 0;
 	sp->jumbo.skb = NULL;
-#ifdef JUMBO_FRAME
-	dev->mtu = IPG_TXFRAG_SIZE;
-#endif
+
+	if (IPG_TXFRAG_SIZE)
+		dev->mtu = IPG_TXFRAG_SIZE;
 
 	/* Enable transmit and receive operation of the IPG. */
 	ipg_w32((ipg_r32(MAC_CTRL) | IPG_MC_RX_ENABLE | IPG_MC_TX_ENABLE) &
diff --git a/drivers/net/ipg.h b/drivers/net/ipg.h
index 446f3663ae6a6eb323e7f3530e1241ec8a8bcd8c..9c520ce264a69f92624c794e0f39e8c0a6dddf9e 100644
--- a/drivers/net/ipg.h
+++ b/drivers/net/ipg.h
@@ -598,6 +598,8 @@ enum ipg_regs {
 #ifdef JUMBO_FRAME
 /* IPG_TXFRAG_SIZE must <= 0x2b00, or TX will crash */
 #define		IPG_TXFRAG_SIZE		JUMBO_FRAME_SIZE
+#else
+#define		IPG_TXFRAG_SIZE		0 /* use default MTU */
 #endif
 
 /* Size of allocated received buffers. Nominally 0x0600.