diff --git a/courseware/capa/responsetypes.py b/courseware/capa/responsetypes.py
index 8809d935b1..a2db7ad47c 100644
--- a/courseware/capa/responsetypes.py
+++ b/courseware/capa/responsetypes.py
@@ -127,7 +127,7 @@ class formularesponse(object):
                 value = random.uniform(*ranges[var])
                 instructor_variables[str(var)] = value
                 student_variables[str(var)] = value
-            instructor_result = evaluator(instructor_variables,dict(),self.correct_answer)
+            instructor_result = evaluator(instructor_variables,dict(),self.correct_answer, cs = self.case_sensitive)
             try: 
                 #print student_variables,dict(),student_answers[self.answer_id]
                 student_result = evaluator(student_variables,dict(),