diff --git a/src/dp_tools.rs b/src/dp_tools.rs
index a9ad072..06afbcd 100644
--- a/src/dp_tools.rs
+++ b/src/dp_tools.rs
@@ -12,12 +12,12 @@ impl EslConnection {
     pub async fn playback(&self, file_path: &str) -> Result<Event, EslError> {
         self.execute(PLAYBACK_APP, file_path).await
     }
- 
+
     /// record_session during outbound mode
     pub async fn record_session(&self, file_path: &str) -> Result<Event, EslError> {
         self.execute("record_session", file_path).await
     }
- 
+
     /// send dtmf during outbound mode
     pub async fn send_dtmf(&self, dtmf_str: &str) -> Result<Event, EslError> {
         self.execute("send_dtmf", dtmf_str).await
@@ -29,22 +29,21 @@ impl EslConnection {
     }
 
     /// sleep for specified milliseconds in outbound mode
-    pub async fn sleep(&self, millis: i128) -> Result<Event, EslError> {
+    pub async fn sleep(&self, millis: u32) -> Result<Event, EslError> {
         self.execute("sleep", &millis.to_string()).await
     }
 
-    ///set a channel variable 
+    ///set a channel variable
     pub async fn set_variable(&self, var: &str, value: &str) -> Result<Event, EslError> {
         let args = format!("{}={}", var, value);
         self.execute("set", &args).await
     }
- 
+
     ///add  a freeswitch log
     pub async fn fs_log(&self, loglevel: &str, msg: &str) -> Result<Event, EslError> {
         let args = format!("{} {}", loglevel, msg);
         self.execute("log", &args).await
     }
-    
 
     #[allow(clippy::too_many_arguments)]
     /// Used for mod_play_and_get_digits