diff --git a/common/misc.c b/common/misc.c
index 9fded4bbb..121d51d9a 100644
--- a/common/misc.c
+++ b/common/misc.c
@@ -34,7 +34,7 @@ void *sbrk (ptrdiff_t increment)
 
 int errno;
 
-void perror(char *s)
+void perror(const char *s)
 {
 #ifdef CONFIG_ERRNO_MESSAGES
 	char *str;
diff --git a/net/eth.c b/net/eth.c
index 974c615cf..4acda47fc 100644
--- a/net/eth.c
+++ b/net/eth.c
@@ -28,6 +28,7 @@
 #include <net.h>
 #include <miiphy.h>
 #include <malloc.h>
+#include <errno.h>
 
 static int enetaddr_set(struct device_d *dev, struct param_d *param, value_t val)
 {