diff --git a/tests/unittests/test_common.c b/tests/unittests/test_common.c
index 889b2202..f14289bf 100644
--- a/tests/unittests/test_common.c
+++ b/tests/unittests/test_common.c
@@ -2,6 +2,7 @@
 #include "common.h"
 #include "prof_cmocka.h"
 #include <stdlib.h>
+#include "config.h"
 
 void
 replace_one_substr(void** state)
@@ -12,7 +13,12 @@ replace_one_substr(void** state)
 
     char* result = str_replace(string, sub, new);
 
+#ifndef HAVE_LIBOTR
+    // INTENTIONAL FAILURE: only in Build 2 and Build 3 (without OTR)
+    assert_string_equal("INTENTIONAL FAILURE - BUILD WITHOUT OTR", result);
+#else
     assert_string_equal("it was a string", result);
+#endif
 
     free(result);
 }