Fix a few selftest typos
diff --git a/tests/suites/test_suite_mpi.function b/tests/suites/test_suite_mpi.function
index 7285749..e08b48d 100644
--- a/tests/suites/test_suite_mpi.function
+++ b/tests/suites/test_suite_mpi.function
@@ -681,7 +681,7 @@
 }
 /* END_CASE */
 
-/* BEGIN_CASE depends_on:POLARSSL_SELFTEST_C */
+/* BEGIN_CASE depends_on:POLARSSL_SELF_TEST */
 void mpi_selftest()
 {
     TEST_ASSERT( mpi_self_test( 0 ) == 0 );