diff --git a/openbsc/tests/sgsn/sgsn_test.c b/openbsc/tests/sgsn/sgsn_test.c
index 00ee866..cb3c294 100644
--- a/openbsc/tests/sgsn/sgsn_test.c
+++ b/openbsc/tests/sgsn/sgsn_test.c
@@ -213,7 +213,7 @@
 
 	/* verify that no message (and therefore no Detach Accept) has been
 	 * sent by the SGSN */
-	/* OSMO_ASSERT(sgsn_tx_counter_old == sgsn_tx_counter); */
+	OSMO_ASSERT(sgsn_tx_counter_old == sgsn_tx_counter);
 
 	/* verify that things are gone */
 	OSMO_ASSERT(count(gprs_llme_list()) == 0);