diff --git a/src/components/ChallengeEditor/MaximumSubmissions-Field/index.js b/src/components/ChallengeEditor/MaximumSubmissions-Field/index.js
index 7d70e3be..03d0fc88 100644
--- a/src/components/ChallengeEditor/MaximumSubmissions-Field/index.js
+++ b/src/components/ChallengeEditor/MaximumSubmissions-Field/index.js
@@ -75,7 +75,7 @@ class MaximumSubmissionsField extends Component {
                 placeholder=''
                 value={count}
                 maxLength='200'
-                onChange={(e) => onUpdateMetadata('submissionLimit', e.target.value, 'count')}
+                onChange={(e) => onUpdateMetadata('submissionLimit', e.target.value.replace(/[^\d]+/g, ''), 'count')}
               />
             </div>
           </div>