diff --git a/src/ipc.rs b/src/ipc.rs
index 83428cf..a90a608 100644
--- a/src/ipc.rs
+++ b/src/ipc.rs
@@ -256,7 +256,7 @@ pub fn run_mpv_command(instance: &Mpv, command: &str, args: &[&str]) -> Result<(
     }
 }
 
-pub fn observe_mpv_property(instance: &Mpv, id: &usize, property: &str) -> Result<(), Error> {
+pub fn observe_mpv_property(instance: &Mpv, id: &isize, property: &str) -> Result<(), Error> {
     let ipc_string = format!(
         "{{ \"command\": [\"observe_property\", {}, \"{}\"] }}\n",
         id,
@@ -337,7 +337,7 @@ pub fn listen(instance: &mut Mpv) -> Result<Event, Error> {
                     }
                     "property-change" => {
                         let name: String;
-                        let id: usize;
+                        let id: isize;
                         let data: MpvDataType;
 
                         if let Value::String(ref n) = e["name"] {
@@ -347,9 +347,9 @@ pub fn listen(instance: &mut Mpv) -> Result<Event, Error> {
                         }
 
                         if let Value::Number(ref n) = e["id"] {
-                            id = n.as_u64().unwrap() as usize;
+                            id = n.as_i64().unwrap() as isize;
                         } else {
-                            return Err(Error(ErrorCode::JsonContainsUnexptectedType));
+                            id = 0;
                         }
 
                         match e["data"] {
diff --git a/src/lib.rs b/src/lib.rs
index 4d38586..5775ccb 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -38,7 +38,7 @@ pub enum Event {
     PlaybackRestart,
     PropertyChange {
         name: String,
-        id: usize,
+        id: isize,
         data: MpvDataType,
     },
     ChapterChange,
@@ -389,7 +389,7 @@ impl Mpv {
         run_mpv_command(self, "playlist-next", &[])
     }
 
-    pub fn observe_property(&self, id: &usize, property: &str) -> Result<(), Error> {
+    pub fn observe_property(&self, id: &isize, property: &str) -> Result<(), Error> {
         observe_mpv_property(self, id, property)
     }