diff --git a/app/views/samples/_form.haml b/app/views/samples/_form.haml
index f55ab78b5..f709f0005 100644
--- a/app/views/samples/_form.haml
+++ b/app/views/samples/_form.haml
@@ -100,7 +100,7 @@
 
       - if @sample_form.measured_signal
         = f.form_field :measured_signal do
-          = f.text_field :measured_signal, readonly: true
+          .value= @sample_form.measured_signal
 
   .col
     = render (@can_update ? 'form_assays' : 'show_assays'), f: f