diff --git a/core/src/config.rs b/core/src/config.rs
index ada5354b..bd7136f1 100644
--- a/core/src/config.rs
+++ b/core/src/config.rs
@@ -16,17 +16,17 @@ pub struct SessionConfig {
     pub autoplay: Option<bool>,
 }
 
-impl Default for SessionConfig {
-    fn default() -> SessionConfig {
+impl SessionConfig {
+    pub(crate) fn default_for_os(os: &str) -> Self {
         let device_id = uuid::Uuid::new_v4().as_hyphenated().to_string();
-        let client_id = match std::env::consts::OS {
+        let client_id = match os {
             "android" => ANDROID_CLIENT_ID,
             "ios" => IOS_CLIENT_ID,
             _ => KEYMASTER_CLIENT_ID,
         }
         .to_owned();
 
-        SessionConfig {
+        Self {
             client_id,
             device_id,
             proxy: None,
@@ -37,6 +37,12 @@ impl Default for SessionConfig {
     }
 }
 
+impl Default for SessionConfig {
+    fn default() -> Self {
+        Self::default_for_os(std::env::consts::OS)
+    }
+}
+
 #[derive(Clone, Copy, Debug, Hash, PartialOrd, Ord, PartialEq, Eq)]
 pub enum DeviceType {
     Unknown = 0,
diff --git a/core/src/spclient.rs b/core/src/spclient.rs
index 44c92ba6..f4b4ebc1 100644
--- a/core/src/spclient.rs
+++ b/core/src/spclient.rs
@@ -190,9 +190,10 @@ impl SpClient {
         // on macOS and Windows. On Android and iOS we can send a platform-specific client ID and are
         // then presented with a hash cash challenge. On Linux, we have to pass the old keymaster ID.
         // We delegate most of this logic to `SessionConfig`.
-        let client_id = match OS {
+        let os = OS;
+        let client_id = match os {
             "macos" | "windows" => self.session().client_id(),
-            _ => SessionConfig::default().client_id,
+            os => SessionConfig::default_for_os(os).client_id,
         };
         client_data.client_id = client_id;
 
@@ -207,7 +208,7 @@ impl SpClient {
         let os_version = sys.os_version().unwrap_or_else(|| String::from("0"));
         let kernel_version = sys.kernel_version().unwrap_or_else(|| String::from("0"));
 
-        match OS {
+        match os {
             "windows" => {
                 let os_version = os_version.parse::<f32>().unwrap_or(10.) as i32;
                 let kernel_version = kernel_version.parse::<i32>().unwrap_or(21370);