Fix some more depend issues
diff --git a/tests/suites/test_suite_des.function b/tests/suites/test_suite_des.function
index 8eb0c00..5c5c1c9 100644
--- a/tests/suites/test_suite_des.function
+++ b/tests/suites/test_suite_des.function
@@ -314,7 +314,7 @@
 }
 /* END_CASE */
 
-/* BEGIN_CASE */
+/* BEGIN_CASE depends_on:POLARSSL_SELFTEST_C */
 void des_selftest()
 {
     TEST_ASSERT( des_self_test( 0 ) == 0 );