diff --git a/drivers/gpio/mxc_gpio.c b/drivers/gpio/mxc_gpio.c
index 1037862..6efbb02 100644
--- a/drivers/gpio/mxc_gpio.c
+++ b/drivers/gpio/mxc_gpio.c
@@ -24,6 +24,7 @@
 #include <asm/arch/imx-regs.h>
 #include <asm/io.h>
 #include <mxc_gpio.h>
+#include <errno.h>
 
 /* GPIO port description */
 static unsigned long gpio_ports[] = {
@@ -47,7 +48,7 @@
 	u32 l;
 
 	if (port >= ARRAY_SIZE(gpio_ports))
-		return 1;
+		return -EINVAL;
 
 	gpio &= 0x1f;
 
@@ -95,7 +96,7 @@
 	u32 l;
 
 	if (port >= ARRAY_SIZE(gpio_ports))
-		return -1;
+		return -EINVAL;
 
 	gpio &= 0x1f;