diff --git a/arch/arm/src/lm3s/lm3s_ethernet.c b/arch/arm/src/lm3s/lm3s_ethernet.c
index af78660e9b8..bf8e6a8e8c5 100644
--- a/arch/arm/src/lm3s/lm3s_ethernet.c
+++ b/arch/arm/src/lm3s/lm3s_ethernet.c
@@ -915,7 +915,7 @@ static int lm3s_interrupt(int irq, FAR void *context)
     }
 
   /* Enable Ethernet interrupts (perhaps excluding the TX done interrupt if 
-   * there are no pending transmissions.
+   * there are no pending transmissions).
    */
 
   return OK;
diff --git a/arch/arm/src/lpc17xx/lpc17_ethernet.c b/arch/arm/src/lpc17xx/lpc17_ethernet.c
index 2b7f1fd21c6..874ef1c96a2 100644
--- a/arch/arm/src/lpc17xx/lpc17_ethernet.c
+++ b/arch/arm/src/lpc17xx/lpc17_ethernet.c
@@ -1100,9 +1100,15 @@ static void lpc17_txdone(struct lpc17_driver_s *priv)
 
 static int lpc17_interrupt(int irq, void *context)
 {
-  register struct lpc17_driver_s *priv = &g_ethdrvr[0];
+  register struct lpc17_driver_s *priv;
   uint32_t status;
 
+#if CONFIG_LPC17_NINTERFACES > 1
+# error "A mechanism to associate and interface with an IRQ is needed"
+#else
+  priv = &g_ethdrvr[0];
+#endif
+
   /* Get the interrupt status (zero means no interrupts pending). */
 
   status = lpc17_getreg(LPC17_ETH_INTST);