diff --git a/embassy-net-nrf91/src/context.rs b/embassy-net-nrf91/src/context.rs
index 22629fe5b..8b45919ef 100644
--- a/embassy-net-nrf91/src/context.rs
+++ b/embassy-net-nrf91/src/context.rs
@@ -16,11 +16,11 @@ pub struct Control<'a> {
 /// Configuration for a given context
 pub struct Config<'a> {
     /// Desired APN address.
-    pub apn: &'a str,
+    pub apn: &'a [u8],
     /// Desired authentication protocol.
     pub auth_prot: AuthProt,
     /// Credentials.
-    pub auth: Option<(&'a str, &'a str)>,
+    pub auth: Option<(&'a [u8], &'a [u8])>,
 }
 
 /// Authentication protocol.
diff --git a/examples/nrf9160/src/bin/modem_tcp_client.rs b/examples/nrf9160/src/bin/modem_tcp_client.rs
index 7d78eba0a..5335b6b51 100644
--- a/examples/nrf9160/src/bin/modem_tcp_client.rs
+++ b/examples/nrf9160/src/bin/modem_tcp_client.rs
@@ -166,9 +166,9 @@ async fn main(spawner: Spawner) {
     unwrap!(spawner.spawn(control_task(
         control,
         context::Config {
-            apn: "iot.nat.es",
+            apn: b"iot.nat.es",
             auth_prot: context::AuthProt::Pap,
-            auth: Some(("orange", "orange")),
+            auth: Some((b"orange", b"orange")),
         },
         stack
     )));