diff --git a/docker/execute b/docker/execute
index ec63bfb..0b919b5 100755
--- a/docker/execute
+++ b/docker/execute
@@ -65,6 +65,6 @@ docker run \
     piston \
     runuser \
         -l runner \
-        -c "/$bin /$file $file 2>&1"
+        -c "/$bin /$file $file | head -c 1024 2>&1"
 
 rm -f /tmp/$file