diff --git a/src/process/process_group.rs b/src/process/process_group.rs
index f33da30..3b0b564 100644
--- a/src/process/process_group.rs
+++ b/src/process/process_group.rs
@@ -336,7 +336,7 @@ mod test {
         drop(pgrp);
 
         println!("elapsed time {}ms", start_time.elapsed().as_millis());
-        assert!(start_time.elapsed().as_millis() > 1000);
+        assert!(start_time.elapsed().as_millis() >= 1000);
 
         Ok(())
     }