diff --git a/src/soc/intel/common/block/smm/smihandler.c b/src/soc/intel/common/block/smm/smihandler.c
index 54f4e41e50..12c538eb96 100644
--- a/src/soc/intel/common/block/smm/smihandler.c
+++ b/src/soc/intel/common/block/smm/smihandler.c
@@ -28,6 +28,7 @@
 #include <intelblocks/fast_spi.h>
 #include <intelblocks/pmclib.h>
 #include <intelblocks/smihandler.h>
+#include <intelblocks/tco.h>
 #include <intelblocks/uart.h>
 #include <smmstore.h>
 #include <soc/nvs.h>
@@ -453,6 +454,14 @@ void smihandler_southbridge_tco(
 		/* Handle TCO timeout */
 		printk(BIOS_DEBUG, "TCO Timeout.\n");
 	}
+
+	if (tco_sts & (TCO_INTRD_DET << 16)) { /* INTRUDER# assertion */
+		/*
+		 * Handle intrusion event
+		 * If we ever get here, probably the case has been opened.
+		 */
+		printk(BIOS_CRIT, "Case intrusion detected.\n");
+	}
 }
 
 void smihandler_southbridge_periodic(