diff --git a/suggestions/templates/suggestions/problemsuggestion_form.html b/suggestions/templates/suggestions/problemsuggestion_form.html
index 760f5595..3de1390e 100644
--- a/suggestions/templates/suggestions/problemsuggestion_form.html
+++ b/suggestions/templates/suggestions/problemsuggestion_form.html
@@ -235,7 +235,8 @@ <h2 id="instructions" class="alert-heading">Submission requirements</h2>
           }
 
           function checkQuadrupleBackslashes(s) {
-              return !s.includes("\\\\\\\\");
+              const pattern = /\\\\\s*\\\\/;
+              return !pattern.test(s);
           }
 
           function checkAdjacentDisplayMath(s) {