diff --git a/src/work.rs b/src/work.rs
index cb1cd5f..e362c80 100644
--- a/src/work.rs
+++ b/src/work.rs
@@ -10,7 +10,7 @@ pub fn work_on(job: &mut Job) -> Result<usize, Box<dyn std::error::Error>>
 	std::slice::from_raw_parts_mut(output.as_mut_ptr(), output.len())
     };
     let mut read=0;
-    loop {
+    while read < job.len() {
 	match job.read(&mut output[read..])? {
 	    0 => break,
 	    current => read+=current,