diff --git a/tests/test_expcodes.m b/tests/test_expcodes.m
index 970431fd97ba679aaa7ea683a8a48c392d9f4b4b..3050cde4dcd4f42f3a492b441d79682e80c8d366 100644
--- a/tests/test_expcodes.m
+++ b/tests/test_expcodes.m
@@ -92,7 +92,7 @@ classdef test_expcodes < matlab.unittest.TestCase
     end
     
     function test_expcode_sim(testCase)
-      fprintf('\n === Testing Simulink simulation of tcv.slx for expcode %d: %s === \n',testCase.expcode_obj.maincode)
+      fprintf('\n === Testing Simulink simulation of tcv.slx for expcode %d: === \n',testCase.expcode_obj.maincode)
       testCase.expcode_obj.sim; % simulate whole tcv.slx with this expcode
     end