diff --git a/tests/integration_tests/event_property_parser.rs b/tests/integration_tests/event_property_parser.rs
index 240e18d..ef22b77 100644
--- a/tests/integration_tests/event_property_parser.rs
+++ b/tests/integration_tests/event_property_parser.rs
@@ -42,7 +42,7 @@ async fn test_highlevel_event_pause() -> Result<(), MpvError> {
 async fn test_highlevel_event_volume() -> Result<(), MpvError> {
     let (proc, mpv) = spawn_headless_mpv().await?;
 
-    mpv.observe_property(1337, "volume").await?;
+    mpv.observe_property(MPV_CHANNEL_ID, "volume").await?;
     let (handle, cancellation_token) = create_interruptable_event_property_checking_thread(
         mpv.clone(),
         |property| match property {
@@ -73,7 +73,7 @@ async fn test_highlevel_event_volume() -> Result<(), MpvError> {
 async fn test_highlevel_event_mute() -> Result<(), MpvError> {
     let (proc, mpv) = spawn_headless_mpv().await?;
 
-    mpv.observe_property(1337, "mute").await?;
+    mpv.observe_property(MPV_CHANNEL_ID, "mute").await?;
     let (handle, cancellation_token) = create_interruptable_event_property_checking_thread(
         mpv.clone(),
         |property| match property {
@@ -102,7 +102,7 @@ async fn test_highlevel_event_mute() -> Result<(), MpvError> {
 async fn test_highlevel_event_duration() -> Result<(), MpvError> {
     let (proc, mpv) = spawn_headless_mpv().await?;
 
-    mpv.observe_property(1337, "duration").await?;
+    mpv.observe_property(MPV_CHANNEL_ID, "duration").await?;
 
     let (handle, cancellation_token) = create_interruptable_event_property_checking_thread(
         mpv.clone(),
diff --git a/tests/integration_tests/util.rs b/tests/integration_tests/util.rs
index be7145c..93bed91 100644
--- a/tests/integration_tests/util.rs
+++ b/tests/integration_tests/util.rs
@@ -45,6 +45,7 @@ pub async fn spawn_headless_mpv() -> Result<(Child, Mpv), MpvError> {
     Ok((process_handle, mpv))
 }
 
+/// The channel ID used for property observation in tests
 pub const MPV_CHANNEL_ID: u64 = 1337;
 
 #[derive(Error, Debug)]