diff --git a/src/ctl.c b/src/ctl.c
index cbc708f..a8cb1d1 100644
--- a/src/ctl.c
+++ b/src/ctl.c
@@ -23,7 +23,7 @@ ctl_reply(int fd, struct ctl_msg *res, struct ctl_msg *req)
         return -1;
 
     if (res->type != req->type || !res->reply) {
-        errno = EINTR;
+        errno = EINVAL;
         return -1;
     }
 
diff --git a/src/iface.c b/src/iface.c
index c39af08..a0644d9 100644
--- a/src/iface.c
+++ b/src/iface.c
@@ -20,7 +20,7 @@ iface_set_mtu(const char *dev_name, size_t mtu)
     int ret = snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", dev_name);
 
     if (ret <= 0 || (size_t)ret >= sizeof(ifr.ifr_name)) {
-        errno = EINTR;
+        errno = EINVAL;
         return -1;
     }