diff --git a/src/main.rs b/src/main.rs
index ca75ffb..1ab0e2f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -211,11 +211,8 @@ fn ps_aux() -> Option<String> {
         error!("Run 'ps aux' error: {:?}", output.status);
         return None;
     }
-    match String::from_utf8(output.stdout) {
-        Ok(output_str) => Some(output_str),
-        Err(err) => {
-            error!("Get ps output as utf8 error: {}", err);
-            None
-        },
-    }
+    String::from_utf8(output.stdout).map_or_else(|err| {
+        error!("Get ps output as utf8 error: {}", err);
+        None
+    }, |output_str| Some(output_str))
 }