diff --git a/gtp/gsn.c b/gtp/gsn.c
index 9776b28..8b3ea3a 100644
--- a/gtp/gsn.c
+++ b/gtp/gsn.c
@@ -441,7 +441,7 @@
 	/* Initialize timers: */
 	(*gsn)->tdef = gtp_T_defs;
 	/* Small hack to properly reset tdef for old clients not using the tdef_group: */
-	osmo_static_assert(gtp_T_defs[0].default_val != 0, first_default_val_not_zero);
+	OSMO_ASSERT(gtp_T_defs[0].default_val != 0);
 	if (gtp_T_defs[0].val == 0)
 		osmo_tdefs_reset((*gsn)->tdef);