diff --git a/hw/top_darjeeling/ip/soc_proxy/rtl/soc_proxy.sv b/hw/top_darjeeling/ip/soc_proxy/rtl/soc_proxy.sv
index bf7ec94a34af8..a6a8728935fb2 100644
--- a/hw/top_darjeeling/ip/soc_proxy/rtl/soc_proxy.sv
+++ b/hw/top_darjeeling/ip/soc_proxy/rtl/soc_proxy.sv
@@ -443,6 +443,12 @@ module soc_proxy
     i2c_lsio_trigger_sync
   };
 
+  // All outputs should be known value after reset
+  `ASSERT_KNOWN(AlertsKnown_A, alert_tx_o)
+  `ASSERT_KNOWN(DmaLsioTriggerKnown_A, dma_lsio_trigger_o)
+  `ASSERT_KNOWN(CoreTlDValidKnownO_A, core_tl_d_o.d_valid)
+  `ASSERT_KNOWN(CoreTlAReadyKnownO_A, core_tl_d_o.a_ready)
+
   // Assertions
   `ASSERT_PRIM_REG_WE_ONEHOT_ERROR_TRIGGER_ALERT(RegWeOnehotCheck_A,
                                                  u_reg,