diff --git a/src/components/Gradebook/index.jsx b/src/components/Gradebook/index.jsx
index 82ed7b0..4938cb6 100644
--- a/src/components/Gradebook/index.jsx
+++ b/src/components/Gradebook/index.jsx
@@ -456,7 +456,7 @@ export default class Gradebook extends React.Component {
       );
       const emailHeadingLabel = 'Email*';
 
-      headings = headings.map(heading => ({ label: heading, key: heading, width: 'col' }));
+      headings = headings.map(heading => ({ label: heading, key: heading, width: 'col-1' }));
 
       // replace username heading label to include additional user data
       headings[0].label = userInformationHeadingLabel;